JP4660414B2 - Pants-type disposable diaper - Google Patents

Description

  The present invention relates to a pants-type disposable diaper, and more particularly, to a pants-type disposable diaper that is excellent in fit to a buttock.

Conventionally, in a pants-type disposable diaper, an elastic member has been provided on an exterior sheet or the like that holds an absorbent body in order to improve fit to the body. (For example, refer patent documents 1-6).
However, the conventional pants-type disposable diaper wraps the entire hemisphere including the left and right buttocks, so that the buttock is bulky and wears easily when viewed from the top of the garment. There was a point.
JP-A-7-265357 JP-A-7-299094 JP-A-11-36103 JP 2001-258931 A JP 2001-204762 A JP 2006-43415 A

  Then, the main subject of this invention is providing the underpants type disposable diaper excellent in the fitting property in a buttocks.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The front body and the back body are respectively connected on both sides, and include an exterior sheet in which a waist opening and a pair of left and right leg openings are formed, and an absorbent main body including an absorber, on the inner surface side of the exterior sheet A pants-type disposable diaper provided with the absorbent main body,
A plurality of waist elastic members reaching from one side to the other side along the waist opening in each of the front body and the back body are arranged at intervals in the vertical direction,
The elongated elastic member that imparts stretchability to the exterior sheet over substantially the entire vertical direction in the portions corresponding to the left side of the left flank, the right side of the sacrum coccyx part and the right heel part in the back body of the exterior sheet A plurality are provided along the direction and at intervals in the vertical direction.
In the portion corresponding to each of the left and right starboard portions of the back body of the exterior sheet, an elongated elastic member that imparts stretchability to the exterior sheet is not provided,
A pants-type disposable diaper characterized by that.

(Function and effect)
In the present invention, by providing the elastic member as described above in the back body, the portions corresponding to the left and right buttocks swell, and the portions corresponding to the sacrum and coccyx between them are recessed, and the three-dimensional body surface. It becomes a shape. Therefore, the fitting property with respect to the buttocks, particularly the intercostal fissure, is enhanced, and the buttocks are less bulky, the wearing is not conspicuous when viewed from the top of the garment, and the back side is less likely to have a gap.
In the present invention, “the elongated elastic member that gives stretchability to the exterior sheet is not provided” means that not only the elastic member is not provided but also the elastic member is provided. This also includes a state in which stretchability is not imparted to the exterior sheet.

<Invention of Claim 2>
The pants-type disposable diaper according to claim 1, wherein the elastic member provided at a portion corresponding to the sacrum coccyx portion has a shorter length as it is closer to the coccyx side.

(Function and effect)
When configured as described in this section, the depressions formed in the portions corresponding to the sacrum and coccyx are in the shape of an inverted triangle, which is extremely preferable because the fit is remarkably improved.

<Invention of Claim 3>
Of the elastic members provided on the left side of the port part and the right side of the starboard part , the elastic member provided below the center in the vertical direction has a width that is lower toward the lower part. The underpants type disposable diaper of Claim 1 or 2 extended to the direction center side.

(Function and effect)
When configured as described in this section, the shape wraps around the bulge of the buttock along the lower left curve of the bulge of the port and the lower right curve of the bulge of the starboard, which significantly improves the fit. This is very preferable.

<Invention of Claim 4>
In the outer sheet, an elastic member is sandwiched between an upper layer nonwoven fabric and a lower layer nonwoven fabric, the elastic member is a rubber thread having a thickness of 200 to 3000 dtex, and a tension is in an extended state of 150 to 300%. The pants-type disposable diaper according to any one of claims 1 to 3, which is provided with an interval of 2 to 20 mm.

(Function and effect)
The above-described features of the present invention are particularly suitable for the exterior sheet configuration and the elastic member configuration as described in this section.

<Invention of Claim 5>
In the front body of the exterior sheet, a central upper part that overlaps the center and upper part of the absorbent body in the width direction, a left part that is defined as a left side range from a part that overlaps the left part of the absorber, and a right part of the absorber A plurality of elongated elastic members that impart stretchability to the exterior sheet along the width direction and at intervals in the vertical direction over each of the right side portion determined as the right range from the overlapping portion Provided,
Of the portion overlapping the absorber in the front body of the exterior sheet, an elongated elastic member that imparts stretchability to the exterior sheet is not provided in a portion excluding the central upper portion, the left portion, and the right portion. ,
The underpants type disposable diaper of any one of Claims 1-4.

(Function and effect)
When the front body is provided with an elastic member as described in this section, the following effects are obtained. That is, first, the upper part of the absorber is pressed against the skin side by the elastic member at the center upper part. This has the effect that the absorber fits against the depression on the upper genital area, especially when the user is a male. Further, the elastic member is provided on the left side portion and the right side portion, and the elastic member is not provided on the central upper portion, the left side portion and the right side portion except for the elastic member, so that both sides in the width direction of the absorber are pulled left and right. Absorber is spread. Therefore, it is possible to suppress a decrease in absorption performance due to the shrinkage of the absorber.

<Invention of Claim 6>
The pants-type disposable diaper according to claim 5, wherein the elastic member provided in the central upper portion has a shorter length as it is closer to the lower side in the vertical direction.

(Function and effect)
When configured as described in this section, the upper side portion of the central portion contracts in the width direction toward the upper side, so that the fit to the depression on the upper side of the genitals is particularly improved in male users.

<Invention of Claim 7>
The elastic member provided below the center in the up-down direction among the elastic members provided in each of the left part and the right part extends to the center in the width direction as the lower one. The pants-type disposable diaper according to 5 or 6.

(Function and effect)
It is very preferable to be configured as described in this section because the fitting property to the crotch portion in the heel portion is improved.

  As described above, according to the present invention, there is an advantage that the fit property to the hip part, particularly the intercostal fissure is increased, the hip part is not bulky, the wearing is not noticeable when viewed from the top of the clothes, and the gap on the back side is hardly generated. Brought about.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a development view of an outer surface side of a pants-type disposable paper diaper example 1, FIG. 2 is a development view of an inner surface side, FIG. 3 is a product state appearance view from the front side, and FIG. is there.
As shown in FIGS. 1 and 2, the pants-type disposable paper diaper 1 (hereinafter simply referred to as a paper diaper) is integrally formed with an absorbent main body 10 containing an absorbent body 13 and an outer surface side of the absorbent main body 10. The exterior sheet 20 is provided, and the front body F and the back body B of the exterior sheet 20 are joined at both sides in a product state to form a waist opening and a pair of left and right leg openings. It is a pants-type paper diaper. The absorbent body 10 can be bonded and integrated on the inner surface side of the exterior sheet 20 with an adhesive such as hot melt, and both sides of the front body F and the back body B can be bonded by heat welding or hot melt adhesive. Can be joined.

(Structure of exterior sheet 20)
In particular, in the illustrated form, both side edges of the front body F and the back body B extend to the crotch part, and are of the so-called boxer underpants type. In the crotch portion, the lower end of the front body F and the lower end of the back body B are connected and continuous via the absorbent main body 10. The curved shapes of the lower end edge of the front body F and the lower end edge CL of the rear body B are the same. The planar shape of the front body F of the exterior sheet 20 is a shape that curves upward only at the lower end edge CL based on a rectangle, and the planar shape of the rear body B is a shape that curves downward only at the lower end edge based on a rectangle. is there. Thereby, the lower end of the back body B is shaped to wrap around the ridge.

  The exterior sheet 20 is a nonwoven fabric sheet having a two-layer structure composed of an upper layer nonwoven fabric and a lower layer nonwoven fabric, and various elastic members are fixed in an expanded state between the upper layer nonwoven fabric and the lower layer nonwoven fabric, so that elasticity is imparted. . In this embodiment, the waist part elastic members 24, 24... For tightening the waist part, the leg part elastic members 26, 26. The fitting elastic members 25, 25..., The curved elastic members 28, 28... That enhance the fitting property to the buttocks, and the surface fitting elastic members 25, 25. Are provided. In the back body B, waist elastic members 24, 24 ..., leg-hole elastic members 26, 26 ..., surface fitting elastic members 25, 25 ..., and lower auxiliary elastic members 27, 27 ... and upper auxiliary elastic members. 29, 29... Are provided.

Hereinafter, each elastic member will be described in detail.
The waist elastic members 24, 24... Are spaced apart in the vertical direction in the vicinity of the waist opening 23 within the range of the side joint edges 21 and 22 where the front body F and the back body B are joined. Moreover, it is a plurality of thread-like elastic members arranged along the circumferential direction of the waist, for tightening and fitting around the waist part of the body.

  Further, the leg-hole elastic members 26, 26,... Are a plurality of thread-like elastic members arranged in the vicinity of the leg opening in the vertical direction and at substantially equal intervals in the vertical direction. For tightening and fitting.

  Since these waist elastic members 24, 24... And leg elastic members 26, 26... Tighten the opening, in order to give a stronger stretching force than the other elastic members 25, 27, 28, 29, It is preferable to use a thick elastic member or to make a plurality of elastic members function substantially as a single elastic member.

  The surface-fit elastic members 25, 25... Are arranged in the vertical direction over the entire range from the upper part to the lower part of the side joint edges 21, 22, particularly the entire lower side where the waist elastic members 24, 24,. Is a thread-like elastic member disposed along the horizontal direction with a substantially equal interval between them, which gives the entire front body F and rear body B an expansion and contraction force in the circumferential direction, and wides the front and rear surfaces of the disposable diaper 1. This is for bringing the range into close contact with the body surface shape. The boundary between the waist elastic members 24, 24... And the surface fit elastic members 25, 25. For example, even if the number of the elastic members arranged in the horizontal direction with the front body F and the back body B being spaced apart in the vertical direction cannot be specified, some of the upper elastic members 24, 24 are on the upper side. .., And the remaining elastic members only have to function as the surface-fit elastic members 25, 25.

  The curved elastic members 28, 28... In the front body F are thread-like elastic members that extend from the side joint edges 21 toward the crotch side along the buttock, and intersect the buttock and the vicinity thereof in the illustrated form. A plurality (preferably 5 or more, particularly preferably 7 or more) are arranged at intervals without being arranged. Specifically, the curved elastic members 28, 28... Are curved so that the side joint edge 21 is positioned above the center of the front body F in the vertical direction and the crotch side is positioned below the center of the vertical direction. Can be placed. Such a curved elastic member 28 improves the fit to the depression of the buttocks and the upper side thereof, and the front portion of the absorbent main body 10 is lifted while being widened, so that the body can be fitted well. .

  The lower auxiliary elastic members 27, 27... In the front body F and the back body B are leg leg elastic members 26, 26... Between the center of each body F, B in the vertical direction and the leg part elastic members 26, 26. On the other hand, it is a thread-like elastic member provided in parallel with the leg-around elastic members 26, 26... The lower auxiliary elastic members 27, 27... Are wider than the leg-hole elastic members 26, 26... And the surface fit elastic members 25, 25. A plurality (preferably 5 or more, particularly preferably 7 or more) can be provided at equal intervals.

  Further, the upper auxiliary elastic members 29, 29... Are arranged in the upper part of the back body B along the circumferential direction, preferably in the middle portion in the width direction, with the waist elastic members 24, 24. It is a thread-like elastic member that is arranged in parallel and slightly lowered to the crotch side on both sides, and has a smaller amount of bulging than the bulging of the buttocks and the abdomen, and compensates for the fit to the upper part of the flat buttocks. The upper auxiliary elastic members 29, 29 ... are wider than the waist elastic members 24, 24 ... and the surface fit elastic members 25, 25 ... (for example, 2 to 5) for the same reason as the lower auxiliary elastic members 27, 27 ... A plurality (preferably 5 or more, particularly preferably 7 or more) can be provided at substantially equal intervals.

  In the back body B, elastic members passing through the portions HL and HR corresponding to the left and right hips, that is, substantially all of the surface fitting elastic members 25, 25, and one of the upper auxiliary elastic members 29, 29, and so on. All of the upper and lower elastic members 27, 27... Are cut finely so as not to give stretchability, and are formed on portions BL, BC, BR corresponding to the left side of the left heel, the sacral coccyx and the right side of the right heel, respectively. Only a plurality of elastic members 25, 29, and 27 that impart stretchability to the exterior sheet 20 are left along the width direction and at intervals in the vertical direction. As a result, the back body B has a three-dimensional shape in which the portions HL and HR corresponding to the left and right buttocks bulge, and the portion BC corresponding to the sacrum and coccyx between them are recessed, which is favorable for the body surface. To fit.

  In particular, it is preferable that the peripheral edge of the cut portion is along the periphery of the bulge of the left and right collars. That is, it is preferable that the elastic members 25, 29, and 27 provided in the portion BC corresponding to the sacral coccyx portion have a shorter length as they are closer to the coccyx side, and are provided on both sides BL and BR of the left and right hips, respectively. Of the elastic members 25, 29, and 27, the elastic members 25 and 27 provided below the center of the back body B in the vertical direction are preferably extended to the center in the width direction as the lower one. Due to the former, the depression formed in the portion BC corresponding to the sacral coccyx part in the back body B has an inverted triangular shape, and the latter has a shape that envelops the bulging of the left and right hips, both of which are preferable because the fit is significantly improved. .

  The position of each part of the human body differs depending on the target size and cannot be generally described. For example, the portions HL and HR corresponding to the left and right buttocks are substantially the left half and the right half of the back body B on the center side in the width direction. The part BC corresponding to the sacral coccyx is halfway and is located at the center in the width direction, and has a predetermined width (for adults, the narrowest part is 1 cm or more, the widest part is 10 cm or more), and the height from the upper end. It is a part extending to a portion below the central portion in the direction.

  On the other hand, the illustrated form is intended for men, and elastic members passing through the portion P overlapping the absorber 13 in the front body F, that is, the lower surface fitting elastic members 25, 25..., The curved elastic members 28, 28. All of the lower auxiliary elastic members 27, 27... Overlap the center upper portion FC in the width direction of the absorber 13 and the upper portion, and the portions that overlap the left portion 13 </ b> L and the right portion 13 </ b> R of the absorber 13 (they The left side portion that is finely cut so as not to give stretchability, except for the integrated region (indicated by the symbol FA), and that is defined as the left range from the portion that overlaps the central upper portion FC and the left side portion 13L of the absorber Elastic member 25 that imparts stretchability to exterior sheet 20 only in FL and right side portion 13R defined as the right range from the portion overlapping with the right side portion of absorber 13 27 and 28 are left a plurality of spaced and spacing in the vertical direction along the width direction.

  If comprised in this way, the absorber 13 will be pressed and fitted with respect to the fall of a genital upper side by the elastic member 25 which remained in the center upper part FC. In particular, the elastic member 25 provided in the central upper portion FC is fit so that the length closer to the lower side in the vertical direction is shorter when the length is shorter in the central upper portion FC, so that the upper side contracts in the width direction. The property is further improved. Of the elastic members 25, 27, 28 provided in the left part FL and the right part FR, the elastic members 25, 27, 28 provided below the center in the vertical direction are the lower ones. Extending to the center in the width direction is preferable because the fit of the buttocks to the crotch portion is improved. Furthermore, as a result of these modeling actions acting comprehensively, as shown in FIG. 3, the central lower part P of the front body F swells and fits so as to wrap the genitals.

  The position of each part in the front body F can be determined as appropriate, but the center upper part FC has a predetermined width (for adults, the narrowest part is 1 cm or more, and the widest part is 10 cm or more). This is a portion extending from a position overlapping the upper edge to a portion overlapping the central portion in the height direction of the absorber 13. The left side portion FL and the right side portion FR are ranges in the width direction from the side edges 21 and 21 to the portions overlapping the left side portion 13L and the right side portion 13R of the absorber 13, and the overlapping width with respect to the absorber 13 is, for example, 5 to 30 mm. be able to.

  On the other hand, as the thread-like elastic members 24 to 29 for imparting stretchability to the exterior sheet 20, styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene, which are usually used. Materials such as butadiene, silicon, and polyester can be used. In addition, the elastic members 24 to 29 of the exterior sheet 20 are preferably disposed with a thickness of 200 to 3000 dtex, a tension of 150 to 300%, and an interval of 2 to 20 mm. In particular, the waist elastic member 24 and the leg elastic member 26 are preferably arranged with a thickness of 400 to 3000 dtex, a tension of 150 to 300%, and an interval of 2 to 10. The bending elastic member 28, the upper auxiliary elastic member 29, and the lower auxiliary elastic member 27 are preferably 200 to 2000 dtex, with a tension of 150 to 280% and a tension of 2 to 20 mm. Is preferably 150 to 300%, and the interval is preferably 2 to 20 mm. Of these elastic members 24 to 29, as at least one elastic member, a tape-like elastic elastic member having a certain width may be used instead of the thread-like elastic elastic member.

  In addition, in order to cut | disconnect and dissect the elastic members 25-29, the cutting method described in Unexamined-Japanese-Patent No. 2002-35029, Unexamined-Japanese-Patent No. 2002-178428, and Unexamined-Japanese-Patent No. 2002-273808 is employ | adopted suitably. can do.

(Structure of the absorbent main body 10)
Next, an example of the structure of the absorbent main body 10 will be described in detail based on FIG. 5 and FIG.
As described above, the absorbent main body 10 has a structure in which an absorbent body 13 such as cotton-like pulp is interposed between a liquid-permeable surface sheet 11 made of a nonwoven fabric or the like and a leak-proof sheet 12 made of polyethylene or the like. And absorbs and retains body fluids.

  The absorbent body 13 preferably has an hourglass-like planar shape with a crotch notched as shown in FIG. 2, but can also be used in which the planar shape is formed into a square shape as shown in FIG. . The absorbent body 13 is surrounded by the crepe paper 14 in order to maintain the shape and improve the diffusibility of the body fluid that has passed through the liquid-permeable surface sheet 11. In addition, as the absorber 13, it is desirable to use the airlaid absorber which can make a volume small.

  As the liquid-permeable surface sheet 11 that covers the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid-permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable surface sheet 11 is wound around the side edge of the absorbent body 13 and extends to the back surface side of the absorbent body 13.

  The leak-proof sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13 is made of a liquid-impervious plastic sheet such as polyethylene or polypropylene, but in recent years has moisture permeability from the viewpoint of preventing stuffiness. Are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

  On the other hand, as shown in FIG. 6, the gathered nonwoven fabric 15 forming the barrier cuffs BS is a nonwoven fabric made into a double sheet by folding, and the side edge portion of the absorbent body 13 entrapped by the liquid-permeable surface sheet 11. Is further wound up from the upper side and extends to the back side of the absorbent body 13 to be bonded. More specifically, the gathered nonwoven fabric 15 has a barrier cuff BS forming portion left in the middle portion in the longitudinal direction of the paper diaper, and a range from the middle portion in the width direction to the back surface side of the absorbent body 13 is bonded by a hot melt adhesive or the like. In addition, at the front and rear end portions in the longitudinal direction, the section from the intermediate portion in the width direction to the one side edge extends in the range extending to the back surface side of the absorber 13, and the portion that forms the barrier cuff BS is the upper surface of the absorber 13. It is bonded with a hot melt adhesive or the like while being folded at the part.

  Inside the gathered nonwoven fabric 15 formed of a double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 16, 16... As shown in FIG. 6 (B), the thread-like elastic elastic members 16, 16... Are for forming a barrier cuff BS by standing up the nonwoven fabric portion protruding from the absorber side edge portion by the elastic elastic force. It is.

  The leak-proof sheet 12 penetrates into the double sheet-like gathered nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the barrier cuff BS as shown in FIG. As the leak-proof sheet 12, it is desirable to use an opaque sheet so as not to cause browning such as defecation and urine. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

  As the thread-like elastic elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and the like that are usually used can be used. Further, the thickness is preferably 925 dtex or less, the tension is 150 to 350%, and the interval is 20 mm or less. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  In the same manner as the liquid-permeable surface sheet 11, the material fiber constituting the gathered nonwoven fabric 15 is made of synthetic fibers such as polyethylene or polypropylene, such as olefin, polyester, and amide, as well as recycled fibers such as rayon and cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.

  The present invention can be used for a pants-type disposable diaper.

It is a development view (outer surface side) of the exterior sheet 20. FIG. 3 is a development view (inner surface side) of the exterior sheet 20. It is a front external view of the wearing state of the underpants type disposable paper diaper concerning the present invention. It is a back external appearance figure of the wearing state of the underpants type disposable paper diaper concerning the present invention. 2 is a plan view of the absorbent main body 10. FIG. (A) is a half cross-sectional view of the absorbent main body 10 in a developed state, and (B) is a diagram showing the product state.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Paper diaper, 10 ... Absorbent main body, 11 ... Liquid-permeable surface sheet, 12 ... Leak-proof sheet, 13 ... Absorber, 14 ... Crepe paper, 15 ... Gathered nonwoven fabric, 16 ... String-like elastic elastic member, 20 ... Exterior sheet 21 ... 22 side edge, 24 ... waist elastic member, 25 ... surface fitting elastic member, 26 ... leg-around elastic member, 27 ... lower auxiliary elastic member, 28 ... curved elastic member, 29 ... upper auxiliary elastic member , CL ... leg circumference cut line, F ... front body, B ... back body, HL ... port part corresponding part, HR ... stark part part, BL ... left side part of port part, BC ... sacral coccyx part part, BR … The right side of the starboard area.

Claims (7)

The front body and the back body are respectively connected on both sides, and include an exterior sheet in which a waist opening and a pair of left and right leg openings are formed, and an absorbent main body including an absorber, on the inner surface side of the exterior sheet A pants-type disposable diaper provided with the absorbent main body,
A plurality of waist elastic members reaching from one side to the other side along the waist opening in each of the front body and the back body are arranged at intervals in the vertical direction,
The elongated elastic member that imparts stretchability to the exterior sheet over substantially the entire vertical direction in the portions corresponding to the left side of the left flank, the right side of the sacrum coccyx part and the right heel part in the back body of the exterior sheet A plurality are provided along the direction and at intervals in the vertical direction.
In the portion corresponding to each of the left and right starboard portions of the back body of the exterior sheet, an elongated elastic member that imparts stretchability to the exterior sheet is not provided,
A pants-type disposable diaper characterized by that.   The pants-type disposable diaper according to claim 1, wherein the elastic member provided at a portion corresponding to the sacrum coccyx portion has a shorter length as it is closer to the coccyx side.   Of the elastic members provided on the left side of the port part and the right side of the starboard part, the elastic member provided below the center in the vertical direction has a width that is lower toward the lower part. The underpants type disposable diaper of Claim 1 or 2 extended to the direction center side.   In the outer sheet, an elastic member is sandwiched between an upper layer nonwoven fabric and a lower layer nonwoven fabric, the elastic member is a rubber thread having a thickness of 200 to 3000 dtex, and a tension is in an extended state of 150 to 300%. The pants-type disposable diaper according to any one of claims 1 to 3, which is provided with an interval of 2 to 20 mm. In the front body of the exterior sheet, a central upper part that overlaps the center and upper part of the absorbent body in the width direction, a left part that is defined as a left side range from a part that overlaps the left part of the absorber, and a right part of the absorber A plurality of elongated elastic members that impart stretchability to the exterior sheet along the width direction and at intervals in the vertical direction over each of the right side portion determined as the right range from the overlapping portion Provided,
Of the portion overlapping the absorber in the front body of the exterior sheet, an elongated elastic member that imparts stretchability to the exterior sheet is not provided in a portion excluding the central upper portion, the left portion, and the right portion. ,
The underpants type disposable diaper of any one of Claims 1-4.   The pants-type disposable diaper according to claim 5, wherein the elastic member provided in the central upper portion has a shorter length as it is closer to the lower side in the vertical direction.   The elastic member provided below the center in the up-down direction among the elastic members provided in each of the left part and the right part extends to the center in the width direction as the lower one. The pants-type disposable diaper according to 5 or 6.

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