JP2020025791A - Disposable diaper - Google Patents

Abstract

To provide a disposable diaper capable of covering properly the body of a wearer, by deforming an absorbent core along a hip and crotch of the body.SOLUTION: A disposable diaper (10) has a pair of inseam elastic parts (41) extending in a cross direction (L) and arranged with an interval in a width direction (W), in an area overlapped with an absorbent core (31) in an inseam area (S3). The absorbent core is provided with a pair of deformable base point parts (85) extending toward the outside in the width direction toward the rear side, on the furthermore rear side with respect to the inseam elastic parts, and arranged with an interval in the width direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a disposable diaper having a pair of crotch elastic portions extending in the front-rear direction in a crotch region.

  2. Description of the Related Art A disposable diaper having a pair of crotch elastic portions extending in the front-rear direction in a crotch region is known (for example, see Patent Document 1). The crotch elastic portion is arranged in a region overlapping the absorbent core. When the crotch elastic part contracts, the absorbent core in the crotch region is pulled up toward the body.

  Further, a pair of groove portions extending in the front-rear direction is formed in the absorbent core of Patent Document 1. The groove-shaped portion serves as a deformation base point of the absorbent core. In the disposable diaper thus configured, at the time of wearing, the absorbent core is deformed from the groove-shaped portion as a base point, and the absorbent core overlapping the crotch elastic portion is pulled up toward the body.

JP 2018-472 A

However, the above-mentioned disposable diaper has the following problems.
The disposable diaper is worn so as to cover the abdomen from the buttocks of the wearer. The shape of the body on which the disposable diaper is worn is the narrowest in the crotch and swells outward in the width direction from the crotch to the buttocks. In the disposable diaper of Patent Literature 1, the absorbent core pulled up by contraction of the crotch elastic portion is pulled up with respect to the wearer's crotch. However, since the crotch elastic portion extends in the front-rear direction from the crotch toward the buttocks, the absorbent core is pulled up to the buttocks in the same manner as the crotch. Therefore, the absorbent core may not be arranged so as to cover the buttocks.

  When the tape-type disposable diaper is worn, the buttocks are placed on the back waist area, the diaper is pulled toward the crotch area, and the body is covered with the crotch area and the front waist area. At this time, if the absorbent core is not deformed along the buttocks, the absorbent core may not fit properly in the crotch of the wearer, and the absorbent core may not fit the crotch. If the absorbent core does not fit the crotch, the diaper is worn with a gap between the crotch and the disposable diaper. When mounted in this manner, the front waist region covering the abdomen may not be sufficiently long in the front-rear direction, and the abdomen may not be properly covered by the front waist region.

  Therefore, a disposable diaper that deforms the absorbent core along the buttocks and crotch of the body and can appropriately cover the wearer's body is desired.

  The disposable diaper according to one aspect, the front and rear direction and width direction orthogonal to each other, the front waist region, the rear waist region, and the crotch region arranged between the front waist region and the rear waist region, at least the crotch A disposable diaper having an absorbent core disposed in a region and a fastening tape disposed in the rear waist region, and extending in the front-rear direction in a region overlapping the absorbent core in the crotch region, and the width A pair of crotch elastic portions arranged at intervals in the direction, the absorbent core, on the rear side of the crotch elastic portion, extends toward the rear side toward the outside in the width direction, In addition, a pair of deformation base points are provided at intervals in the width direction.

It is the top view seen from the skin side of the disposable diaper which concerns on embodiment. It is a top view of the absorption core concerning an embodiment. It is a schematic cross section along the AA cross section of the disposable diaper shown in FIG. It is a schematic cross section along the BB cross section of the disposable diaper shown in FIG. It is a schematic cross section along the CC cross section of the disposable diaper shown in FIG. It is the figure which showed typically the mounting state in the AA cross section of a disposable diaper. It is a figure for explaining a modification of an absorber in a BB section of a disposable diaper. It is the figure which showed typically the mounting state of the disposable diaper which concerns on embodiment. It is a figure showing an absorption core which has a modification origin part concerning a modification.

(1) Outline of Embodiment At least the following matters will be apparent from the description of the present specification and the accompanying drawings.
The disposable diaper according to one aspect, the front and rear direction and width direction orthogonal to each other, the front waist region, the rear waist region, and the crotch region arranged between the front waist region and the rear waist region, at least the crotch A disposable diaper having an absorbent core disposed in a region and a fastening tape disposed in the rear waist region, and extending in the front-rear direction in a region overlapping the absorbent core in the crotch region, and the width It has a pair of crotch elastic parts arranged at intervals in the direction, the absorbent core, on the rear side than the crotch elastic part, extends toward the rear side toward the outside in the width direction, In addition, a pair of deformation base points are provided at intervals in the width direction.

  According to this aspect, when the disposable diaper is mounted, the buttocks are placed on the rear waist region, and when the diaper is pulled toward the crotch region, the absorbent core extends inward in the width direction from the rear waist region toward the crotch region. Deformation is performed with the deformation base point as a base point. The absorbent core is deformed such that the length in the width direction is reduced toward the crotch region side, and is deformed convexly toward the body side by contraction of the pair of crotch elastic portions in the crotch region. Therefore, the absorbent core can be compactly accommodated in the gap between both feet of the wearer while covering the absorbent core with a wide area over the buttocks of the wearer. By arranging the disposable diaper at an appropriate position between the crotch of the wearer, the front waist region can be pulled to a position covering the abdomen of the wearer at the time of wearing. In a tape-type disposable diaper, a wearer's body can be covered appropriately.

  According to a preferred aspect, an outer edge of the crotch elastic portion may be arranged on an inner side in the width direction than an outer edge of the deformation base point.

  According to this aspect, the deformation of the absorbent core based on the deformation base point and the deformation of the absorbent core by the crotch elastic portion are more easily linked. Therefore, the absorbent core deformed so that the length in the width direction becomes shorter from the rear waist region toward the crotch region becomes easier to arrange closer to the body side in the crotch region.

  According to a preferred aspect, at least a part of the deformation base point may be disposed on a first extension line extending rearward from a rear end edge of the crotch elastic portion.

  According to this aspect, the deformation of the absorbent core based on the deformation base point and the deformation of the absorbent core by the crotch elastic portion are more easily linked. Therefore, the absorbent core deformed so that the length in the width direction becomes shorter from the rear waist region toward the crotch region becomes easier to arrange closer to the body side in the crotch region.

  According to a preferred aspect, the fastening tape has an engaging portion that engages with the front waistline region, and the deformation base portion includes a center in the front-rear direction of the disposable diaper and a front end edge of the engaging portion. A first intermediate line located in the middle of the front-rear direction may be straddled in the front-rear direction.

  According to this aspect, the area behind the first intermediate line is the area where the buttocks are to be placed when worn. The transformation base point straddles the first intermediate line in the front-rear direction, and is arranged from a region where the buttocks of the wearer are placed to a region where the buttocks are not placed. At the time of mounting, in a state where the area behind the first intermediate line is pressed by the buttocks, the area where the buttocks are not placed is pulled forward, and the absorbent core is more easily deformed with the deformation base point as the base point.

  According to a preferred aspect, a front end edge of the deformed base point is located forward of a second intermediate line located at an intermediate position in the front-rear direction between a rear end edge of the deformed base point and a rear end edge of the crotch elastic portion. May be arranged.

  According to this aspect, the deformation base portion is provided over half or more of the region between the rear end edge of the deformation base portion and the rear end edge of the crotch elastic portion. Therefore, the deformation of the absorbent core based on the deformation base point and the deformation of the absorbent core by the crotch elastic portion are easily linked. Therefore, the absorbent core can be easily deformed into a shape along the body from the rear waistline region to the crotch region, and the absorbent core can be compactly arranged in the crotch region while covering the buttocks.

  According to a preferred aspect, a high-rigidity portion having higher rigidity than a region outside in the width direction than the deformation base point may be provided between the pair of deformation base points.

  According to this aspect, since the high rigidity portion is provided between the deformation base portions, a rigidity difference occurs between a region outside the deformation base portion in the width direction and a region inside the deformation base portion, and The absorbent core is more easily deformed from the base point. Therefore, the absorbent core is easily deformed such that the length in the width direction becomes shorter toward the crotch region side, and the absorbent core is more easily fit in the wearer's crotch. The disposable diaper can be arranged at an appropriate position between the wearer's crotches, and can appropriately cover the wearer's body.

  According to a preferred aspect, the deformation base portion may be adjacent to the high-rigidity portion in the width direction.

  According to this aspect, the region outside the deformation base portion in the width direction is more easily deformed than the region between the deformation base portions, and the absorbent core is more easily deformed due to the difference in rigidity.

  According to a preferred aspect, the deformation base portion may be constituted by a pressing portion in which the absorbent core is compressed in a thickness direction.

  According to this aspect, the deformation base portion formed by the compressed portion has high rigidity, and the deformation of the absorbent core is more easily stabilized.

  According to a preferred aspect, the pair of deformed base portions are disposed so as to sandwich the center in the width direction of the disposable diaper, and at least a part of the deformed base portion is arranged in the width direction of the absorbent core. It may be arranged outside the third intermediate line located in the middle of the center and the maximum width of the absorbent core in the width direction.

  According to this aspect, in the region equal to or more than half in the width direction of the absorbing core, the absorbing core is easily deformed from the deformation base point. The absorbent core is easily deformed such that the length in the width direction is reduced toward the crotch region side in a wide range of the absorbent core, and the absorbent core is more easily fit in the wearer's crotch.

  According to a preferred aspect, the leg circumference elastic portion that expands and contracts in the front-rear direction outside the absorbent core in the width direction, and the leg elastic portion extends outward from the deformation base portion in the width direction. It may be located on a second extension that extends.

  According to this aspect, when the buttocks are placed on the rear waist region and the diaper is pulled toward the crotch region, the rear waist region is pressed by the buttocks and the region outside the absorbent core in the width direction is in close contact with the legs. Since the absorbent core is deformed in a state where the leg elastic part and the buttocks are fitted to the body, the absorbent core is more easily deformed with the deformation base point as a base point.

  According to a preferred aspect, the leg elastic portion may extend outward in the width direction toward the rear side.

  According to this aspect, the leg extension and contraction portion extending outward in the width direction toward the rear side is in close contact with the body, so that the buttocks of the wearer can be covered with the disposable diaper. With the buttocks covered in a wide range toward the rear side, the absorbent core can be deformed so that the length in the width direction of the absorbent core decreases toward the crotch region. While properly absorbing the absorbent core between the wearer's crotches, the disposable diaper covers the entire body and suppresses leakage.

  According to a preferred aspect, the outer portion of the disposable diaper has a side flap portion extending outward in the width direction toward the rear side, and the side flap portion has the width from the deformation base point portion. It may be arranged on a second extension line extending along the direction.

  According to this aspect, when the buttocks are placed on the rear waist region and the diaper is pulled toward the crotch region, the rear waist region is pressed by the buttocks, and the side flaps in the width direction outside of the absorbent core easily hit the legs. . Therefore, the absorbent core is deformed in a state where the side flap portion located on the outside in the width direction and the region where the buttocks are placed are pressed down, and the absorbent core is more easily deformed with the deformed base portion as the base point.

  According to a preferred aspect, the crotch elastic portion may be disposed on a third extension line extending along the deformation base point portion and extending forward from a front end edge of the deformation base point portion.

  According to this aspect, the deformation of the absorbent core based on the deformation base portion and the deformation of the absorbent core by the crotch elastic portion are easily linked. Therefore, the absorbent core deformed so that the length in the width direction becomes shorter from the rear waist region toward the crotch region becomes easier to arrange closer to the body side in the crotch region.

(2) Overall Schematic Configuration of Disposable Diaper Hereinafter, a disposable diaper according to an embodiment will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. In addition, parts having different dimensional relationships and ratios between drawings may be included.

  The disposable diaper is a tape-type disposable diaper. FIG. 1 is a plan view of the disposable diaper 10 according to the present embodiment as viewed from the skin side, and FIG. 2 is a plan view of the absorbent core according to the embodiment as viewed from the skin side. The plan views shown in FIGS. 1 and 2 show the disposable diaper in an extended state. FIG. 3 is a schematic cross-sectional view along the AA cross section of the disposable diaper shown in FIG. FIG. 4 is a schematic cross-sectional view along the BB cross section of the disposable diaper shown in FIG. FIG. 5 is a schematic cross-sectional view along a CC cross section of the disposable diaper shown in FIG. In addition, the extended state in this invention is the state which extended the disposable diaper 10 to the state where a wrinkle is not formed. The natural state in the present invention means that in the case of the disposable diaper 10 housed in a package, the disposable diaper 10 is taken out from the package and is placed under an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH. It is in a state of being left for 24 hours.

  The disposable diaper 10 has a front-rear direction L and a width direction W orthogonal to each other. The front-back direction L is defined by a direction extending to the front side of the body and the rear side of the body. In other words, the front-back direction L is a direction that extends back and forth in the deployed disposable diaper 10. Further, the disposable diaper 10 has a thickness direction T orthogonal to both the front-rear direction L and the width direction W. The thickness direction T extends to a skin surface side T1 facing the wearer side and a non-skin surface side T2 opposite to the skin surface side.

  The disposable diaper 10 has a front waistline region S1, a rear waistline region S2, and a crotch region S3. The front waistline region S1 is a region facing the wearer's front waistline (abdomen). The rear waistline region S2 is a region facing the rear waistline (back) of the wearer and includes a region where the body (buttock) is placed when worn. The inseam area S3 is an area located at the inseam of the wearer and arranged between the front waist area S1 and the rear waist area S2. The crotch region S3 is a region where a leg opening is provided around the leg of the wearer. The leg opening is a portion that is recessed inward in the width direction from the outer edge of the disposable diaper.

  The disposable diaper 10 includes an absorbent core 31 including an absorbent material. The absorbent core 31 includes an absorbent material such as ground pulp or superabsorbent polymer (SAP), or a mixture thereof. The absorbent core 31 may be covered by a core wrap 32. The absorber 30 may be constituted by the absorbent core 31 and the core wrap 32. The core wrap 32 may be formed of a tissue, and may be disposed on the skin side T1 of the absorbent core 31 and on the non-skin side of the absorbent core.

  As shown in FIGS. 1 and 3, a top sheet 21 and a side sheet 22 may be provided on the skin side T1 of the absorber 30 including the absorbent core 31. The topsheet 21 may be arranged across the center of the absorber 30 in the width direction W. The side sheet 22 may be arranged so as to cover an outer portion of the top sheet 21. The top sheet 21 and the side sheets 22 may be formed of a liquid-permeable sheet such as a nonwoven fabric or a perforated plastic film. The inner portion of the side sheet 22 may be folded and overlapped. Between the overlapping side sheets 22, a leak-proof extension / contraction section 43 that extends and contracts in the front-back direction L may be provided. The leak-proof extension / contraction section 43 may be made of a thread rubber that extends and contracts in the front-rear direction L. The side sheet 22 and the leakproof expansion / contraction part 43 constitute leakproof gathers 60 that stand on the skin side T1 when worn.

  On the non-skin side T2 of the absorber 30, a back sheet 23 and an exterior sheet 24 may be provided. The exterior sheet 24 may be provided on the non-skin side T2 of the back sheet 23. The length of the back sheet 23 in the width direction W is shorter than the length of the outer sheet 24 in the width direction W, and the length of the back sheet 23 in the front-rear direction L is shorter than the length of the outer sheet 24 in the front-rear direction L. The back sheet 23 may be formed of a liquid impermeable film. The exterior sheet 24 may be made of a liquid-permeable nonwoven fabric.

  A fastening tape 91 is provided on the outer side of the rear waist area. The fastening tape 91 has a base portion 92 and an engaging portion 93. The base portion 92 is arranged between the exterior sheet 24 and the side sheet 22 in the thickness direction T, and extends outward from the exterior sheet 24 and the side sheet 22 in the width direction W. The engaging portion 93 is arranged on the base portion 92 and engages with the target portion 95 (see FIG. 5). The target portions 95 are arranged at intervals in the width direction in the front waistline region S1, and are configured such that the fastening tapes 91 are fixed thereto.

  An indicator 51 may be arranged between the back sheet 23 and the absorber 30. The indicators 51 may extend in the front-rear direction L and may be arranged at intervals in the width direction W. The indicator 51 is arranged between the low basis weight parts 33 described later. The indicator 51 is configured to be discolored by the absorption of the body fluid by the absorber, so that the absorption state of the body fluid can be grasped from the non-skin surface side T2 of the disposable diaper 10.

  The disposable diaper 10 may include a leg elastic portion 42 that expands and contracts in the front-rear direction outside the absorbent core 31 in the width direction. The leg elastics 42 may be provided between the side sheet 22 and the back sheet 23 and between the side sheet 22 and the exterior sheet 24. The leg-surrounding elastic part 42 is configured by a band-like elastic sheet that expands and contracts in the front-rear direction L. Due to the contraction of the leg elastic portion 42, the leg opening of the disposable diaper 10 fits around the leg when worn.

  The disposable diaper 10 may have a waist elastic portion 45 extending in the width direction W along the rear edge of the disposable diaper. The waist elastic portion 45 may be provided between the back sheet 23 and the exterior sheet 24, between the top sheet 21 and the exterior sheet 24, and between the side sheet 22 and the exterior sheet 24. The rear edge of the waist elastic portion 45 may be located forward of the rear edge of the disposable diaper, and the front edge of the hip elastic portion 45 may be located forward of the rear edge of the absorbent core 31. The waist elastic portion 45 may extend outside the absorbent core 31 in the width direction W. The waist elastic portion 45 is configured by a band-shaped elastic sheet that expands and contracts in the width direction W.

  The disposable diaper 10 may have a pair of crotch elastic portions 41 provided in a region overlapping the absorbent core 31 in the crotch region. The inseam extension / contraction portion 41 is arranged on the non-skin side with respect to the absorbent core 31. The crotch elastic portion 41 may be provided between the back sheet 23 and the exterior sheet 24. The crotch elastic portions 41 extend in the front-rear direction L and are arranged at intervals in the width direction W. The crotch elastic portions 41 are not arranged at the center of the absorbent core 31 in the width direction W, but are arranged two each on both sides of the center of the absorbent core 31 in the width direction W. Therefore, due to the contraction of the crotch elastic portion 41, the absorbent core in the region overlapping the crotch elastic portion 41 is pulled up toward the body from the center in the width direction of the absorbent core. The pair of crotch elastic portions 41 may be located inside the outer edge of the absorbent core 31 in the width direction. The region located between the pair of crotch elastic portions 41 is pulled up toward the body with respect to the region outside the pair of crotch elastic portions 41 in the width direction. Therefore, the center in the width direction of the absorbent core is deformed in a convex shape with the side portion as a base point, and the fit to the crotch of the body can be secured. The inseam extension / contraction portion 41 is formed of a thread rubber arranged along the front-rear direction L. In other forms, the crotch elastic part 41 may be configured by a band-shaped elastic sheet that expands and contracts in the front-rear direction, may be configured by one thread rubber, or may be configured by three or more thread rubbers. It may be configured. Further, in the present invention, the overlapping state is a state in which one member and the other member overlap in a plan view, and the other member is arranged on the skin surface side or the non-skin surface side of one member. It is in the state that it is. The overlapping state includes not only a state in which one member and the other member are in contact with each other, but also a configuration in which another member is interposed between the one member and the other member.

  The inseam elastic portion 41 may straddle the center 10LC of the disposable diaper in the front-rear direction. Due to the contraction of the inseam expansion / contraction portion 41, the center 10LC in the front-back direction of the disposable diaper can be pulled up toward the body. In particular, if the disposable diaper is folded in two so that the skin side faces each other before use, the folding habit due to folding can be raised. In other forms, the crotch elastic portion 41 does not straddle the center 10LC in the front-rear direction of the disposable diaper, and may be arranged only on the front side of the center 10LC or only on the rear side of the center 10LC. May be arranged.

  The inseam expansion / contraction portion 41 is located inside the outer edge of the absorbent core 31 in the width direction W. Outside the crotch elastic portion 41 in the width direction W of the absorbent core 31, a region where the contraction force of the crotch elastic portion 41 is unlikely to act is provided. FIG. 3 shows a side region R31 located outside the crotch elastic portion 41 in the absorbent core 31 and a central region R32 between the side regions R31. The side region R31 is a region located in the width direction W outside of the crotch elastic portion 41 located in the width direction W. The center region R32 is a region in which a region overlapping with the crotch elastic portion 41 and a region located inside the crotch elastic portion 41 in the width direction W are combined. The center region R32 is pulled up toward the body with respect to the side region R31 due to the contraction of the crotch elastic portion 41. The deformation of the absorbent core 31 when worn will be described later in detail.

  In addition, the elastic part including the leak-proof elastic part 43, the leg elastic part 42, the waist elastic part 45, and the crotch elastic part 41 in the present invention is in a state in which elastic members such as thread rubber and elastic sheets can expand and contract. It is a portion where the elastic member is arranged in a state where the elastic member does not expand and contract. That is, the elastic part is an effective length part of the elastic member constituting the elastic part.

(3) Configuration of Absorbing Core Next, the configuration of the absorbing core 31 will be described in detail with reference to FIG. The absorbent core 31 has a narrow portion 35 whose length in the width direction is shorter than the maximum width 31M of the absorbent core 31, and a wide portion disposed outside the narrow portion 35 in the front-rear direction. The narrow portion 35 is arranged between the wide portions arranged before and after. The length of the narrow portion 35 in the width direction increases toward the outside in the front-rear direction L. The shape of the absorbent core 31 in plan view is an hourglass shape. The shape of the absorber including the core wrap as well as the absorbent core 31 may be an hourglass shape.

  The absorbent core 31 may have a low basis weight portion 33 in which the basis weight of the absorbent material is lower than the surrounding area. The low basis weight portion 33 is provided along the front-back direction L. The low basis weight portion 33 only needs to extend in the front-rear direction L, and may be parallel to the front-rear direction L, or may be inclined at an angle of less than 90 degrees with respect to the front-rear direction L.

  The low basis weight portion 33 is a portion in which the basis weight of the absorbent material is lower than that of the surrounding absorbent core 31, and is thinner and less rigid than the peripheral absorbent core 31. Therefore, the low basis weight portion 33 tends to be a deformation base point in the mounted state. A deformation base point extending in the front-rear direction in the worn state is easily formed in the absorbent core 31. The low basis weight portion 33 may be a portion where the basis weight of the absorbing material is substantially zero (including a portion where the design basis weight is 0, but the surrounding absorbing material is mixed), It may be a portion where an absorbent material having a smaller basis weight is disposed. The low basis weight portion 33 may be a slit having a fixed length in the width direction W, or may be a notch whose length in the width direction W is practically zero. The length in the width direction W of each low basis weight portion 33 may be 2 mm or more and 10 mm or less, and more preferably, the thickness of the absorbent core 31 or more and 8 mm or less. When the length in the width direction of the low basis weight portion 33 is equal to or greater than the thickness of the absorbent core 31, the absorbent core 31 is easily deformed in the thickness direction based on the low basis weight portion 33. In addition, since the length in the width direction of the low basis weight portion 33 is 8 mm or less, the anxiety about the absorption performance due to the long length in the width direction of the low basis weight portion can be suppressed before and after the low basis weight portion 33. The length of the direction L may be 30 mm or more and 180 mm or less.

  The low basis weight portions 33 are arranged in pairs in the width direction W at intervals. The low basis weight portions 33 may be arranged on both sides of the center 10WC in the width direction of the disposable diaper with an interval in the width direction W. The center in the front-rear direction of the low basis weight portion 33 may be arranged on the rear side of the center 10LC in the front-rear direction of the disposable diaper. The front edge 33F of the low basis weight portion 33 may be located on the front side of the front edge 41F of the crotch elastic portion 41, and the rear end edge 33R of the low basis weight portion 33 is formed with the rear edge 41R of the crotch elastic portion 41. It may be located in front of the matching or trailing edge 41R. The outer edge of the low basis weight portion 33 may coincide in the width direction with the rubber thread located on the outer side in the width direction among the thread rubbers constituting the crotch elastic portion 41, and the inner edge of the low basis weight portion 33 is Of the thread rubber constituting the inseam extension / contraction portion 41, the thread rubber located on the inner side in the width direction may coincide with the thread rubber in the width direction.

  The absorbent core 31 may have a high-rigidity portion 70 having higher rigidity than the surrounding area. The high-rigidity portion 70 has a central high-rigidity portion 71 disposed between the pair of crotch elasticity portions 41, a rear high-rigidity portion 72 disposed rearward of the crotch elasticity portion 41, and a lower rigidity portion 41. And a front high rigidity portion 73 disposed on the front side. The central high rigidity portion 71, the rear high rigidity portion 72, and the front high rigidity portion 73 are separated from each other in the front-rear direction L.

  The high-rigidity portion 70 is a region having higher bending rigidity than the surrounding region. The high-rigidity portion 70 may be a portion having a higher basis weight than a surrounding region, or may be a portion in which the absorbent core 31 is compressed in the thickness direction. The high-rigidity portion 70 of the present embodiment is a portion provided with a compressed portion in which the absorbent core 31 is compressed. The compressed portion may be formed by compressing at least the absorbent core 31 in the thickness direction T, and may be formed by compressing another member such as the core wrap 32 and the absorbent core 31.

  The central high rigidity portion 71 is provided in a region between the pair of low basis weight portions 33. The front edge 71F of the central high rigidity portion 71 may be coincident with the front edge 33F of the low basis weight portion 33 or may be located behind the front edge 33F of the low basis weight portion 33. The rear end edge 71R of the central high rigidity portion 71 may be located on the front side of the rear end edge 33R of the low basis weight portion 33. The center of the central high rigidity portion 71 in the front-rear direction may be disposed on the front side of the center of the low basis weight portion 33 in the front-rear direction. The central high-rigidity portion 71 may be arranged at an interval from the low-basis-weight portion 33 in the width direction W. The central high rigidity portion 71 may straddle the center 10LC in the front-rear direction of the disposable diaper and the center 10WC in the width direction W of the disposable diaper.

  The inseam extension / contraction portion 41 may be located on both sides of the center of the central high-rigidity portion 71 in the width direction, and may extend rearward of the central high-rigidity portion 71. The first region R41 in which the crotch elastic portion 41 is arranged on the rear side of the central high rigidity portion 71 and the first region R41 in which the central high rigidity portion 71 and the crotch elastic portion 41 overlap in the thickness direction or the width direction. A second region R <b> 42 and a third region R <b> 43 in which the central high-rigidity portion 71 is arranged on the front side of the crotch elastic portion 41 may be provided. The first region R41 and the second region R42 are adjacent in the front-rear direction L, and the second region R42 and the third region R43 are adjacent in the front-rear direction L. The rear edge of the first region R41 coincides with the rear edge 41R of the crotch elastic portion 41, and the front edge of the first region R41 coincides with the rear edge 71R of the central high rigidity portion 71. The rear edge of the second region R42 matches the front edge of the first region R41, and the front edge of the second region R42 matches the front edge 41F of the crotch elastic portion 41. The rear edge of the third region R43 matches the front edge of the second region R42, and the front edge of the third region R43 matches the front edge 71F of the central high rigidity portion 71.

  The rear high rigidity portion 72 may be disposed on the rear side of the low basis weight portion 33. The outer edge of the rear high rigidity portion 72 may extend outward in the width direction W toward the rear side. The length of the front edge of the rear high rigidity portion 72 in the width direction W may be longer than the length of the central high rigidity portion 71 in the width direction W. The rear high rigidity portion 72 may straddle the center 10WC in the width direction W of the disposable diaper.

  The front high rigidity portion 73 may be disposed on the front side of the low basis weight portion 33. The front high-rigidity portions 73 may be arranged on both sides of the center 10WC in the width direction W of the disposable diaper with an interval in the width direction W. The front edge of the front high-rigidity portion 73 may extend toward the outside in the width direction W.

  The absorbent core 31 may include a pair of deformation base portions 85 provided on the rear side of the crotch elastic portion 41. The deformation base point portion 85 extends rearward and outward in the width direction W behind the inseam extension / contraction portion 41, and is arranged in a pair at intervals in the width direction W. The deformation base point portion 85 is a base point at which the absorbing core 31 is deformed in the thickness direction. The deformation base point portion 85 of the present embodiment is configured by the outer portion 72S of the rear high rigidity portion 72. The deformation base portion 85 has a base edge 85E that is an edge of the deformation base point. The base edge is an edge on which a polygonal line having the thickness of the absorbent core 31 is formed. The base edge 85E of the present embodiment is the outer edge 72E of the rear high rigidity portion 72. The deformed base portion 85 of the present embodiment includes a region extending inward in a direction perpendicular to a line along the base edge 85E from the base edge 85E to the thickness of the absorbent core 31.

  Here, the outer portion in the present invention is a portion occupying a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is an outer edge in the width direction W. Further, the inner portion is a portion occupying a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is an inner edge in the width direction W. In addition, the deformation | transformation base part 85 should just be a base point from which the absorption core 31 deform | transforms in a thickness direction, and is not limited to the outer part of the highly rigid part by a pressing part. A modification base point in another aspect will be described later.

(4) Modification when Wearing Disposable Diaper Next, a modification when attaching the disposable diaper 10 will be described with reference to FIGS. 6 to 8. FIG. 6 is a diagram schematically showing a state of attachment of the disposable diaper in an AA cross section. Drawing 7 is a figure for explaining a modification of an absorber at the time of wearing in the BB section of a disposable diaper. Drawing 8 is a figure showing typically the wearing state of the disposable diaper concerning an embodiment, and was the figure which looked at the wearer of the sleeping state from the front side. A line BL shown in FIG. 6 indicates a line of the body of the wearer.

  When mounting the tape-type disposable diaper 10, first, the buttocks of the wearer are placed on the rear waist region S2 of the disposable diaper 10 with the disposable diaper 10 expanded. Then, the disposable diaper 10 is passed between the legs of the wearer, the diaper is pulled toward the crotch region, and the body is covered with the crotch region. At this time, the disposable diaper is pulled in the front-rear direction, and the absorbent core 31 is easily deformed with the deformation base portion 85 as a base point. The deformation base point portion 85 is provided on the rear side of the crotch elastic portion 41 located in the crotch region, and the deformation base point of the absorbent core 31 is formed on the rear side of the crotch elastic portion 41. The deformation base point portion 85 extends rearward and outward in the width direction W, and a deformation base point extending inward in the width direction W from the rear waistline region toward the crotch region is formed in the absorbent core 31. You.

  Therefore, when the buttocks are placed on the rear waist area and the diaper is pulled toward the crotch area, the absorber is deformed by the base point extending inward in the width direction W from the rear waist area to the crotch area. Specifically, as shown in FIG. 7, the absorber in the area where the deformation base portion 85 is provided is deformed with the outer edge 72E of the rear high rigidity portion 72 (the base edge 85E of the deformation base portion 85) as a base point. The area inside the outer edge 72E in the width direction W is arranged closer to the skin surface than the area outside the outer edge 72E in the width direction W. The reason why the region inside the width direction W with respect to the outer edge 72E is arranged closer to the skin surface than the region outside the width direction W with respect to the outer edge 72E is as follows. The center in the width direction W is pulled up to the body side, the wearer generally applies a force to the center in the width direction W of the absorbent core 31 when pulling the diaper, and the outer portion ( This is because the center of the absorbent core 31 in the width direction W is pulled up in a state in which the legs (for example, the vicinity of the leg opening) are hooked on the legs. The absorbent core 31 is deformed such that the length in the width direction W becomes shorter toward the crotch region side by being deformed around the deformed base portion 85 as a base point.

  As shown in FIGS. 6 and 8, the absorbent core 31 located on the front side of the deformation base portion 85 is deformed in a convex shape toward the body side by the contraction of the pair of crotch elastic portions 41, and the central region R32 becomes the side region R31. Stand up against. Therefore, the absorbent core 31 in the crotch region is arranged along the body side, and the absorbent core 31 can be properly accommodated in the wearer's crotch.

  While covering the absorbent core 31 with a wide area over the buttocks of the wearer, the absorbent core 31 can be compactly stored in the gap between both feet of the wearer. By arranging the disposable diaper at an appropriate position between the crotch of the wearer, the front waistline region can be pulled to a position covering the abdomen of the wearer. In a tape-type disposable diaper, a wearer's body can be covered appropriately.

  The outer edge of the crotch elastic portion 41 may be arranged outside the outer edge of the deformation base portion 85 in the width direction W. However, more preferably, the outer edge of the crotch expanding / contracting portion 41 may be disposed inside the outer edge of the deformation base portion 85 in the width direction W. According to such a configuration, the deformation of the absorbent core 31 based on the deformation base point portion 85 and the deformation of the absorbent core 31 by the crotch elastic portion 41 are more easily linked. Therefore, the absorbent core 31 deformed so that the length in the width direction W becomes shorter from the rear waist region toward the crotch region becomes easier to dispose closer to the body side in the crotch region. The outer edge of the crotch elastic portion 41 is the outer edge of the elastic member located most outside in the width direction W among the elastic members constituting the crotch elastic portion 41. The rubber thread constituting the crotch elastic portion 41 of the present embodiment is arranged along the front-rear direction, and an elastic member located outside in the width direction W forms an outer edge of the crotch elastic portion 41.

  The deformation base portion 85 and the crotch elastic portion 41 may be shifted in the width direction W. However, more preferably, at least a portion of the deformation base point portion 85 may be disposed on the first extension line EL1 extending rearward from the rear end edge of the crotch elastic portion 41. The deformation of the absorbent core 31 based on the deformation base portion 85 and the deformation of the absorbent core 31 by the crotch elastic portion 41 are more easily linked. Therefore, the absorbent core 31 deformed so that the length in the width direction W becomes shorter from the rear waist region toward the crotch region becomes easier to dispose closer to the body side in the crotch region. In the case where a plurality of elastic members constituting the crotch expanding / contracting portion 41 are provided, the deformation base point portion 85 may be arranged on at least an extension of any one of the elastic members.

  The deformation base point portion 85 may straddle the first intermediate line ML1 located in the middle of the front-rear direction L between the center 10LC of the disposable diaper in the front-rear direction and the front end edge of the engaging portion 93 in the front-rear direction L. As shown in FIG. 1, the first intermediate line ML <b> 1 is a line that passes through the center in the front-rear direction between the front-rear center 10 </ b> LC of the disposable diaper and the front end edge of the engaging portion 93 and extends in the width direction W. The area behind the first intermediate line ML1 is an area where the buttocks are generally placed at the time of wearing. The deformation base point portion 85 straddles the first middle line ML1 in the front-rear direction, and is arranged from a region where the buttocks of the wearer is placed to a region where the buttocks are not placed. At the time of mounting, in a state where the area behind the first intermediate line ML1 is pressed by the buttocks, the area where the buttocks are not placed is pulled forward, and the absorbent core 31 is further deformed with the deformation base point 85 as the base point. easy. Therefore, the absorbent core 31 is deformed so that the width of the absorbent core 31 is shortened, the disposable diaper is disposed at an appropriate position between the wearers' crotches, and the wearer's body can be appropriately covered.

  Further, the rear end edge 41R of the crotch elastic portion 41 may be arranged on the front side of the first intermediate line ML1. The rear edge 41R of the inseam extension / contraction portion 41 is arranged in a region where the buttocks of the wearer are not placed. At the time of mounting, in a state where the area behind the first intermediate line ML1 is pressed by the buttocks, the area where the buttocks are not placed is pulled forward, and the crotch elastic portion 41 is more likely to expand. Therefore, the region where the crotch elastic portion 41 is arranged is more easily pulled up with respect to the body, and the absorbent core 31 can be properly accommodated in the wearer's crotch.

  The front end edge of the deformed base portion 85 may be disposed on the front side of the second intermediate line ML2 located in the middle in the front-rear direction between the rear end edge of the deformed base portion 85 and the rear end edge of the crotch elastic portion 41. As shown in FIG. 1, the second intermediate line ML <b> 2 is a line that passes through the middle in the front-rear direction between the rear end edge of the deformation base point 85 and the rear end edge 41 </ b> R of the crotch elastic portion 41 and extends in the width direction W. . Of the region between the rear end edge of the deformed base portion 85 and the rear end edge of the crotch elastic portion 41, the deformed base portion 85 is provided over half or more of the region. Therefore, the deformation of the absorbent core 31 based on the deformation base point portion 85 and the deformation of the absorbent core 31 by the inseam extension / contraction portion 41 are easily linked. Therefore, the absorbent core 31 can be easily deformed into a shape along the body from the rear waistline region S2 to the crotch region S3, and the absorbent core 31 can be compactly arranged in the crotch region while covering the buttocks. The disposable diaper can be arranged at an appropriate position between the wearer's crotches, and can appropriately cover the wearer's body.

  A high-rigidity portion having a higher rigidity than a region outside the width direction W than the deformation base portion 85 may be provided between the pair of deformation base portions 85. In the present embodiment, the outer portion of the rear high-rigidity portion forms the deformation base point portion 85, and the region between the outer portions of the rear high-rigidity portion forms the high-rigidity portion of the present configuration. Since the high-rigidity portion is provided between the deformation base portions 85, a rigidity difference occurs between a region outside the deformation base portion 85 in the width direction W and a region inside the deformation base portion 85. With the base point 85, the absorbent core 31 is more easily deformed. Therefore, the absorbent core 31 is easily deformed so that the length in the width direction W becomes shorter toward the crotch region side, and the absorbent core 31 is more easily accommodated in the wearer's crotch. By disposing the disposable diaper at an appropriate position between the wearer's crotches, the wearer's body can be appropriately covered.

  In addition, as in a deformation base portion according to a modification example described later, in a deformation base portion having relatively low rigidity (for example, a deformation base portion 85C formed of a low basis weight portion), a portion between the pair of deformation base portions 85 is used. May be higher than the rigidity of the base point of the deformation.

  The high rigidity portion between the pair of deformation base portions 85 may be adjacent to the deformation base portion 85 in the width direction W. A region outside the deformation base portion 85 in the width direction W is more easily deformed than a region between the deformation base portions 85, and the absorption core 31 is more easily deformed due to a difference in rigidity. Further, the pair of deformation base portions 85 are integrated by the high rigidity portion. The deformation base portion 85 and the high-rigidity portion are integrated and easily deformed in a convex shape toward the wearer, so that the absorbent core 31 can be more easily accommodated in the crotch of the wearer.

  In the present embodiment, the deformed base portion 85 and the high-rigidity portion between the deformed base portions 85 are each formed by a rear high-rigidity portion formed of a compressed portion. As described above, the deformation base portion 85 and the high-rigidity portion may be formed integrally, and the boundary between the deformation base portion 85 and the high-rigidity portion may not be formed. The entire rear high rigidity portion may exhibit the function as the deformation base portion 85 and the function as the high rigidity portion. In addition, the deformation base portion 85 formed of the compressed portion has a high rigidity, and the deformation of the absorbent core 31 is more easily stabilized.

  The pair of deformed base portions 85 are arranged so as to sandwich the center of the disposable diaper in the width direction W, and at least a part of the deformed base portion 85 is formed of the center of the absorbent core 31 in the width direction W and the maximum width of the absorbent core 31. May be arranged outside the third middle line ML3 located in the middle in the width direction W. As shown in FIG. 1, the third intermediate line ML3 is a line that passes through the center between the width direction W of the absorbent core 31 and the center of the maximum width of the absorbent core 31 and extends in the front-rear direction. In a region equal to or more than half of the width direction W of the absorbing core 31, the absorbing core 31 is easily deformed with the deformation base portion 85 as a base point. The absorbent core 31 is easily deformed such that the length in the width direction W is reduced toward the crotch region side in a wide range of the absorbent core 31, and the absorbent core 31 is more easily fit in the wearer's crotch.

  Leg extension / contraction portion 42 may be arranged on second extension line EL2 extending outward in width direction W from deformation base point portion 85. The second extension line EL2 is a line extending from an arbitrary position of the deformation base portion 85 to the outside in the width direction W, and a plurality of the second extension lines EL2 are provided at different positions in the front-rear direction. It is only necessary that at least a part of the leg-surrounding elastic portion 42 is arranged on any of the second extension lines EL2. When the buttocks are placed on the rear waist region and the diaper is pulled toward the crotch region, the rear waist region is pressed by the buttocks, and the region outside the absorbent core 31 in the width direction W is in close contact with the legs. Since the absorbent core 31 is deformed in a state where the leg-surrounding elastic part and the buttocks are fitted to the body, the central region R32 is more easily raised with respect to the side region R31 on the front side than the buttocks, and the absorbent core 31 It becomes easier to deform as a base point.

  Further, the leg-surrounding elastic part 42 may be arranged on an extension extending from the inseam elastic part 41 to the outside in the width direction W. When the absorbent core 31 is deformed in a state where the leg elastics are fitted to the body, the central region R32 is more easily raised with respect to the side regions R31. Due to the contraction of the crotch elastic portion 41, the absorbent core 31 is more easily pulled up toward the wearer.

  The leg circumference elastic part 42 may extend outward in the width direction W toward the rear side. The elastic part around the leg extending toward the outside in the width direction W toward the rear side comes into close contact with the body, so that the buttocks of the wearer can be covered with the disposable diaper. In a state where the buttocks are covered in a wide range toward the rear side, the absorbent core 31 can be deformed so that the length in the width direction W of the absorbent core 31 becomes shorter toward the crotch region. While properly absorbing the absorbent core 31 between the wearer's crotches, the entire body can be covered with the disposable diaper and leakage can be suppressed.

  Outside the absorption core 31 in the width direction W, there is a side flap portion 27 extending rearward and outward in the width direction W, and the side flap portion 27 is disposed on the second extension line EL2. Good. The side flap portion 27 is a portion that extends rearward and outward in the width direction W in the outer portion of the disposable diaper, and is a hatched portion in FIG. When the buttocks are placed on the rear waist region and the diaper is pulled toward the crotch region, the rear waist region is pressed by the buttocks, and the side flap portions outside the absorbent core 31 in the width direction W are more likely to hit the legs. Accordingly, the absorbent core 31 is deformed in a state where the side flap portion located outside in the width direction W and the region where the buttocks are placed are pressed, and is more easily deformed with the deformation base point portion 85 as a base point.

  The low basis weight portion 33 may be arranged in a region overlapping with the crotch elastic portion 41. The absorbent core 31 is deformed based on a low basis weight portion extending in the front-rear direction when worn. Therefore, the absorption core 31 is easily deformed due to the contraction of the crotch expansion / contraction portion 41 toward the body side due to the convex shape, and the absorption core 31 can be properly accommodated in the wearer's crotch. The low basis weight portion 33, which is a deformation base point of the absorbent core 31, has a lower basis weight than the surrounding region, can suppress the thickness even after absorbing the body fluid, and can maintain the deformed state.

  The crotch elastic portions 41 may be arranged on both outer sides in the width direction W with respect to the central high rigidity portion 71. Due to the contraction of the crotch elastic portion 41, a region outside the central high rigidity portion 71 in the width direction W can be pulled up toward the body. Therefore, the vicinity of the low basis weight portion 33 is easily deformed in a convex shape toward the body. Further, the central high rigidity portion 71 is not easily contracted by the crotch elastic portion 41. Therefore, while ensuring the absorption area, the convex shape along the crotch is maintained, and leakage can be reduced.

(5) Modification Next, a modification base point according to a modification will be described. FIG. 9 is a diagram schematically illustrating a plane of an absorption core 31 having a deformation base point according to a modification. In the following description of the modified example, only the configuration different from the above-described embodiment will be described, and the description of the same configuration as the embodiment will be omitted using the same reference numerals.

  FIG. 9A shows an absorbent core 31A having a deformed base point portion 85A according to the first modified example. The deformation base portions 85A are arranged in a pair at intervals in the width direction W. The deformation base point portion 85A is arranged on the inner side in the width direction W than the crotch elastic portion 41, and is not arranged on the first extension line EL1. The deformation base portion 85A is constituted by a pressing portion.

  FIG. 9B shows an absorbent core 31B having a modified base portion 85B according to the second modified example. The deformation base points 85B are arranged as a pair at intervals in the width direction W. The deformation base point portion 85A is arranged outside the crotch elastic portion 41 in the width direction W, and is not arranged on the first extension line EL1. The deformation base portion 85A is constituted by a pressing portion.

  As shown in Modification 2, the crotch elastic portion 41 may be arranged on the third extension line EL3 extending along the deformation base point 85 and extending forward from the front end edge of the deformation base point 85. The third extension line EL3 is a line extending along the deformation base point 85, and is a line extending forward from the front end edge of the deformation base point 85. The deformation of the absorbent core 31B based on the deformation base point portion 85 and the deformation of the absorbent core 31B by the crotch elastic portion 41 are easily linked. Therefore, the absorbent core 31B deformed so that the length in the width direction W becomes shorter from the rear waist region toward the crotch region becomes easier to arrange closer to the body side in the crotch region.

  FIG. 9C illustrates an absorbent core 31C having a modified base point portion 85C according to Modified Example 3. The deformation base portion 85C is constituted by the low basis weight portion of the absorbent core. When the absorbent core 31C according to the modified example is pulled toward the crotch region at the time of mounting, a bent line is formed starting from the inner end edge of the slit, and deformed in the thickness direction. Therefore, the base edge 85E according to the third modification is configured by the inner edge of the deformation base portion 85C.

  The measurement of the "basis weight of the absorbent core" in this specification is performed by the following measuring method. When the disposable diaper 10 is enclosed in a package or the like, a sample that is taken out of the package and left in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 12 hours is used. In a disposable diaper wrapped with a packaging sheet or the like, the packaging sheet is opened and the folded disposable diaper is deployed. Next, a portion for measuring the grammage is cut out from the disposable diaper, and a portion other than the absorbent core such as a topsheet is removed from the cut out portion. Then, the area and weight of the portion for measuring the grammage of the absorbent core are measured. The basis weight is calculated based on the weight and the area.

  “Bending rigidity” in the present specification may be a value measured by Gurley hardness. The Gurley rigidity can be measured using a No. 311 Gurley-type flexibility tester manufactured by Yasuda Seiki Seisakusho in accordance with JIS-L1096. The length in the width direction W of the sample for measuring the Gurley rigidity can be 30 mm, and the length in the front-rear direction can be 25 mm.

  Although the present invention has been described in detail with reference to the above embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed aspects without departing from the spirit and scope of the present invention defined by the description of the claims. Therefore, the description in this specification is for the purpose of illustrative explanation, and has no restrictive meaning to the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, a disposable diaper which can deform | transform an absorption core along a buttocks and a crotch of a body and can cover a wearer's body appropriately can be provided.

Reference Signs List 10 disposable diaper 10LC: center of diaper in the front-rear direction 10WC: center of diaper in the width direction 21 top sheet 22 side sheet 23 back sheet 24 exterior sheet 27 side flap portion 30 absorber 31 absorption core 32 core wrap 33 low basis weight portion 41 inseam Elastic part 42 Leg elastic part 43 Leak prevention elastic part 45 Waist elastic part 51 Indicator 71 Central high rigidity part 72 Rear high rigidity part 85 Deformation base part 91 Fastening tape 92 Base part 93 Engaging part EL1 First extension line EL2 First 2 extension line EL3 3rd extension line ML1 1st intermediate line ML2 2nd intermediate line ML3 3rd intermediate line S1 Front waist area S2 Rear waist area S3 Inseam area T Thickness direction T1 Skin side T2 Non-skin side L Front-back direction W width direction

Claims (13)

A front-rear direction and a width direction orthogonal to each other,
Front waist area, rear waist area, and crotch area disposed between the front waist area and the rear waist area,
At least an absorbent core arranged in the crotch region,
A fastening tape disposed in the rear waist area, and a disposable diaper having:
In a region of the crotch region overlapping with the absorbent core, the pair of crotch elastic portions extending in the front-rear direction and arranged at intervals in the width direction,
In the absorbent core, on the rear side of the crotch elastic portion, a pair of deformation base portions extending outward toward the rear side in the width direction toward the rear side, and arranged at intervals in the width direction. Disposable diapers that are provided.   2. The disposable diaper according to claim 1, wherein an outer edge of the crotch elastic portion is arranged on an inner side in the width direction than an outer edge of the deformation base portion. 3.   The disposable diaper according to claim 1, wherein at least a part of the deformation base point is disposed on a first extension line extending rearward from a rear edge of the crotch elastic portion. The fastening tape has an engaging portion that engages with the front waist area,
The said deformation | transformation origin part straddles in the said front-back direction the 1st intermediate line located in the said front-back direction intermediate | middle of the center of the said disposable diaper in the front-back direction, and the front edge of the said engaging part. The disposable diaper according to any one of claims 1 to 3.   A front end edge of the deformation base point portion is disposed on a front side of a second intermediate line located at an intermediate position in the front-rear direction between a rear end edge of the deformation base point portion and a rear end edge of the crotch elastic portion. The disposable diaper according to any one of claims 1 to 4.   The high rigidity part whose rigidity is higher than the area | region outside of the said width direction in the said width direction rather than the said deformation | transformation base point part is provided between the pair of deformation | transformation base parts. The disposable diaper described in.   The disposable diaper according to claim 6, wherein the deformation base portion is adjacent to the high-rigidity portion in the width direction.   The disposable diaper according to any one of claims 1 to 7, wherein the deformation base portion is configured by a pressing portion in which the absorbent core is compressed in a thickness direction. The pair of deformation base portions are disposed so as to sandwich the center in the width direction of the disposable diaper,
At least a part of the deformation base point portion is disposed outside the width direction with respect to a third intermediate line located between a center of the absorption core in the width direction and a maximum width of the absorption core. The disposable diaper according to any one of claims 1 to 8. Having a leg elastic portion that expands and contracts in the front-rear direction on the outer side in the width direction than the absorbent core,
The disposable diaper according to any one of claims 1 to 9, wherein the leg-surrounding elastic portion is disposed on a second extension line extending outward from the deformation base portion in the width direction.   The disposable diaper according to claim 10, wherein the leg-surrounding elastic portion extends outwardly in the width direction toward the rear side. The outer portion of the disposable diaper has a side flap portion extending outward in the width direction toward the rear side,
The disposable diaper according to any one of claims 1 to 11, wherein the side flap portion is arranged on a second extension line extending along the width direction from the deformation base point portion.   The said crotch expansion-contraction part is arrange | positioned along the said deformation | transformation base part, and is arrange | positioned on the 3rd extended line extended from the front end edge of the said deformation | transformation base part to the front side. Disposable diapers.

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