JP2021106719A - Interdental cleaner - Google Patents

Abstract

To provide an interdental cleaner which enhances cleaning ability by elongating a cleaning part body while securing the strength of a cleaning part, the interdental cleaner being suitable for cleaning an interdental space between back teeth.SOLUTION: The interdental cleaner comprises: a body which includes a base and a shaft 3 arranged on one end side of the base; and a cleaning part body 4 which is made of an elastic material having hardness lower than that of the body, covers a prescribed length of the shaft from the tip to the base, and has an outer shape insertable into an interdental space. The cleaning part body comprises: a cover part 41 adhering to the whole circumference of the prescribed length of the shaft; and a brush 42 having a plurality of bristles projecting outward from the cover part. The cover part has a first cover part 411 and a second cover part 412 arranged from the tip to the base in this order, the second cover part having a degree of diameter increase from the tip to the base smaller than that of the first cover part.SELECTED DRAWING: Figure 2

Description

The present invention relates to an interdental cleaning tool for cleaning the interdental space.

Conventionally, an interdental cleaning tool suitable for cleaning the interdental space of molars is known (see, for example, Patent Document 1). The interdental cleaning tool described in Patent Document 1 has a handle portion as a handle that can be gripped by a finger (corresponding to a "grip portion" in the present application) and a core portion extending from the handle portion (in the present application, "" It is equipped with a cleaning section for cleaning between teeth, which is located on the tip side of the "shaft"). By inserting the cleaning portion between the teeth and moving it back and forth, it is possible to remove foreign matter (such as food residue) caught between the teeth and foreign matter (such as plaque) adhering to the teeth.

The cleaning portion of the interdental cleaning tool described in Patent Document 1 is configured by integrally molding a cleaning portion main body made of an elastomer material on the tip end side of a core portion made of synthetic resin. The portion of the core portion covered by the main body of the cleaning portion is formed in a gently tapered shape whose diameter decreases from the base end side to the tip end side. The main body of the cleaning portion has a coating portion coated on the core portion and a plurality of protrusions formed so as to project outward at intervals in the longitudinal direction of the coating portion.

International Publication No. 2014/0653668

In the interdental cleaning tool described in Patent Document 1, the wall thickness (thickness) of the covering portion of the cleaning portion main body is substantially constant from the tip end side to the base end side (see FIG. 3 of Patent Document 1). On the other hand, since the core portion is formed in a gently tapered shape that shrinks in diameter from the proximal end side to the distal end side, the outer diameter of the cleaning portion including the core portion and the covering portion is from the distal end side to the proximal end side. It gradually grows toward. Since there is a limit to the outer diameter of the cleaning portion that can be inserted between the teeth, in the configuration of the cleaning portion described in Patent Document 1, it is not possible to increase the length of the cleaning portion main body that can be inserted between the teeth and reciprocated. Have difficulty. If the length of the cleaning unit body is short, the cleaning ability of the interdental cleaning tool may be insufficient.

In order to increase the length of the cleaning portion main body in the configuration of the interdental cleaning tool described in Patent Document 1, it is necessary to reduce the outer diameter of the core portion or reduce the wall thickness of the entire covering portion. If the outer diameter of the core is reduced, it becomes difficult to secure the strength required for the cleaning part of the interdental cleaning tool, and if the wall thickness of the entire covering part is reduced, the entire cleaning part body including the covering part is filled with elastomer. It becomes difficult to do.

Furthermore, if a portion of the cleaning portion having a large outer diameter is inserted between the teeth and reciprocated, a part of the cleaning portion main body may be torn and broken due to frictional resistance between the cleaning portion main body and the teeth. ..

Therefore, in the interdental cleaning tool suitable for cleaning the space between the back teeth, it is desired to use an interdental cleaning tool that enhances the cleaning ability by increasing the length of the cleaning unit body while ensuring the strength of the cleaning unit. ing.

The interdental cleaning tool according to one aspect of the present invention comprises a main body having a base portion and a shaft portion arranged on one end side of the base portion, and an elastic material having a hardness lower than the hardness of the main body portion. A cleaning unit main body that covers a predetermined length from the tip of the shaft portion toward the base portion and has an outer shape that can be inserted between teeth is provided, and the cleaning unit main body has the predetermined length of the shaft portion. It is composed of a covering portion that is in close contact with the entire circumference and a brush portion having a plurality of bristles protruding outward from the covering portion, and the covering portion has a first covering portion and a first coating portion from the tip toward the base portion. The two covering portions are arranged in this order, and the second covering portion is characterized in that the degree of diameter expansion in the direction from the tip to the base portion is smaller than the degree of diameter expansion of the first coating portion. ..

In this interdental cleaning tool, the degree of diameter expansion in the direction from the tip of the second coating to the base is smaller than the degree of diameter expansion in the direction of the first coating, so that the degree of expansion of the coating is outward in the direction from the tip to the base. Spreading is suppressed in the second coating as compared to the first coating. As a result, even if the cleaning unit main body (second covering portion) is lengthened, the diameter of the cleaning unit main body is not extremely increased, and the entire cleaning unit main body can be inserted between the teeth for cleaning. As a result, it is possible to secure a large stroke amount of the cleaning unit main body that can be inserted between the teeth and enhance the cleaning ability of the interdental cleaning tool.

Further, in this inter-tooth cleaning tool, it is not necessary to reduce the outer diameter of the shaft portion in order to increase the stroke amount of the cleaning portion main body, so that the strength required for the cleaning portion of the inter-tooth cleaning tool can be maintained. .. Further, since it is not necessary to reduce the wall thickness of the entire covering portion, the entire cleaning portion main body including the covering portion can be filled with the elastomer.

Furthermore, since the cleaning unit body is not extremely enlarged in diameter even if the cleaning unit body is lengthened, it is possible to reduce the frictional resistance between the cleaning unit body and the teeth when the cleaning unit body is inserted between the teeth. , It is possible to prevent a part of the main body of the cleaning unit from being torn and broken during cleaning. In this way, in the interdental cleaning tool that cleans the space between the back teeth, the length of the cleaning part body is lengthened to improve the cleaning ability while ensuring the strength of the cleaning part consisting of the shaft part and the cleaning part body. We were able to provide an interdental cleaning tool.

As another configuration, it is preferable that the portion of the shaft portion of the main body covered by the cleaning portion main body has a linear taper from the base portion toward the tip end.

In this way, the portion of the shaft portion covered by the cleaning portion main body has a linear taper from the base portion to the tip portion, so that the covering portion can be easily formed into a desired outer shape and the covering portion can be formed. Can be brought into close contact with the shaft portion.

As another configuration, it is preferable that the portion of the shaft portion of the main body covered by the second coating portion and the outer peripheral surface of the second coating portion are parallel to the axis of the shaft portion.

In this way, since the portion of the shaft portion covered by the second coating portion and the outer peripheral surface of the second coating portion are parallel to the shaft core of the shaft portion, the outer diameter of the second coating portion is from the tip. It does not spread outward in the direction toward the base, and the entire cleaning portion can be easily inserted between the teeth for cleaning no matter how long the length of the cleaning portion main body (second covering portion) is. In addition, the frictional resistance between the cleaning unit body and the teeth when the cleaning unit is inserted between the teeth can be further reduced, so that a part of the cleaning unit body is severely torn and broken during cleaning. Can be suppressed.

As another configuration, it is preferable that the wall thickness of the second coating portion gradually decreases in the direction from the tip end to the base portion.

In this way, the material cost of the elastic material can be saved, so that the manufacturing cost can be reduced. Further, even if the portion of the shaft portion covered by the cleaning portion main body has a linear taper, the outer diameter of the second covering portion is not expanded according to the taper.

It is a perspective view which shows the interdental cleaning tool which concerns on 1st Embodiment. It is a partially enlarged sectional view which shows the cleaning part main body which concerns on 1st Embodiment. It is a partially enlarged sectional view which shows the cleaning part main body which concerns on the modification of 1st Embodiment. It is a top view which shows the interdental cleaning tool which concerns on another embodiment.

Hereinafter, embodiments of the interdental cleaning tool according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the gist thereof.

[First Embodiment]
As shown in FIGS. 1 and 2, the interdental cleaning tool D according to the present embodiment has a main body A in which a base portion 1 having a grip portion 11 and an extension portion 12, a bent portion 2 and a shaft portion 3 are integrally molded. It is made of a soft member which is an elastic material having a hardness lower than the hardness of the main body A, and includes a cleaning portion main body 4 which covers the shaft portion 3. Hereinafter, the portion of the shaft portion 3 covered by the cleaning portion main body 4 and the cleaning portion main body 4 are collectively referred to as a cleaning portion B. The user has the grip portion 11, inserts the cleaning portion B between teeth such as molars, and moves the cleaning portion B back and forth to use the interdental cleaning tool D. Hereinafter, among the interdental cleaning tools D, the outside of the flexion (right side of the paper surface in FIG. 1) from the base portion 1 to the flexion portion 2 will be described as the dorsal side, and the inside of the flexion (the left side of the paper surface in FIG. 1) will be described as the ventral side.

The main body A is composed of one or a combination of two or more synthetic resins such as polypropylene, ABS, polybutylene terephthalate, polycarbonate, polyethylene terephthalate, polystyrene, and polyacetal. The main body A in this embodiment is made of polypropylene. Further, it is preferable that the synthetic resin constituting the main body A contains a reinforcing agent for increasing the rigidity. Examples of the reinforcing agent include fibrous reinforcing agents such as glass fiber, nanocellulose fiber, aramid fiber, and carbon fiber, plate-shaped reinforcing agent such as mica and glass frame, powder-like strengthening agent such as talc, and wallastnite. Needle-shaped strengthening agent can be mentioned. The content of the fortifier is 5% by weight or more and 50% by weight or less, preferably 10% by weight or more and 40% by weight or less, and more preferably 15% by weight or more and 40% by weight or less.

The soft member, which is the material of the cleaning unit main body 4, is made of an elastomer having a hardness lower than the hardness of the main body A. As this elastomer, a styrene-based elastomer is preferable, and silicon, an olefin-based elastomer, a polyester-based elastomer, or the like may be used.

In the main body A, the extending portion 12 is formed in the shape of a flat rod extending from the grip portion 11 in the first direction Xa. Further, the bent portion 2 extends from the end portion of the extending portion 12 opposite to the grip portion 11, and intersects the first direction Xa from the first direction Xa (in the embodiment of FIG. 1, the bending internal angle is 120). Degree) It is composed of a flat shape that is bent toward the second direction Xb. The intersection angle (bending internal angle) between the first direction Xa and the second direction Xb is composed of 30 degrees or more and 150 degrees or less, preferably 80 degrees or more and 140 degrees or less, and more preferably 100 degrees or more and 130 degrees or less. It is good to be there.

A back surface portion 5 covered with a soft member is formed on about half of the extending portion 12 and the bent portion 2 of the main body A on the dorsal side. Synthetic resin is exposed on about half of the extending portion 12 and the bending portion 2 of the main body A on the ventral side.

In the main body A, the shaft portion 3 is formed in the shape of a conical base rod that gradually tapers along the second direction Xb from the end portion opposite to the extending portion 12 with respect to the bent portion 2 (FIG. 2). reference). In the present embodiment, the outer shape of the entire shaft portion 3 becomes smaller (reduced in diameter) at a constant rate from the connection portion with the bent portion 2 (hereinafter, may be referred to as “base end”) toward the tip end. ) It has a tapered surface (an example of a linear taper) 31.

The cleaning portion main body 4 made of a soft member has an outer shape that covers the entire outer peripheral surface of the shaft portion 3 and can be inserted between teeth, and constitutes the cleaning portion B together with the shaft portion 3. The cleaning unit main body 4 in the present embodiment includes a covering portion 41 that covers and adheres to the entire longitudinal direction (direction along the second direction Xb) of the shaft portion 3, and a plurality (many) protruding outward from the covering portion 41. It has a brush portion 42 having bristles. The covering portion 41 has a wall thickness (thickness) smaller than the diameter of the shaft portion 3. The brush portion 42 is formed in a conical shape that becomes tapered as it is separated from the covering portion 41 (as it goes outward in the radial direction with respect to the shaft core X of the shaft portion 3). In the interdental cleaning tool D according to the present embodiment, when the cleaning portion B is inserted between the teeth, the bristles of the brush portion 42 are flexibly deformed, and the covering portion 41 and the brush portion 42 come into contact with the teeth. , Foreign matter existing between teeth (food residue, etc.) and foreign matter adhering to teeth (plaque, etc.) can be removed. The back surface portion 5 formed on the back side of the extending portion 12 and the bent portion 2 is integrally formed with the cleaning portion main body 4. The cleaning unit main body 4 may have a structure that covers a part of the shaft portion 3 from the tip end in the longitudinal direction of the shaft portion 3.

Next, a method of manufacturing the interdental cleaning tool D according to the present embodiment will be described. The interdental cleaning tool D is manufactured by a two-color molding method in which the cleaning portion main body 4 and the like are molded on the shaft portion 3 of the main body A made of synthetic resin by a known method such as injection molding. Specifically, first, the main body A is formed by a known method such as injection molding. Next, the formed main body A is placed on a mold for two-color molding, and the molten elastomer is injected into the mold from a gate provided near the tip of the shaft portion 3 of the main body A to fill the mold. The filled molten elastomer solidifies into a soft member, and the cleaning portion main body 4 and the back surface portion 5 are formed. In this way, the interdental cleaning tool D is manufactured.

Next, the structure of the cleaning unit main body 4 of the interdental cleaning tool D according to the present embodiment will be described in detail. As described above, the cleaning unit main body 4 of the interdental cleaning tool D includes a covering portion 41 that covers the entire circumference of the shaft portion 3 and covers a predetermined length and is in close contact with the cleaning portion, and a plurality (many) of the covering portions 41 that protrude outward. It has a brush portion 42 having bristles. As shown in FIG. 2, the covering portion 41 has a first covering portion 411, a second covering portion 412, and a boundary portion 413 which is a boundary portion between the first covering portion 411 and the second covering portion 412. In order to facilitate understanding of the structure of the cleaning portion main body 4, in FIG. 2, the taper angle θ of the tapered surface 31 of the shaft portion 3, that is, the inclination of the tapered surface 31 with respect to the shaft core X of the shaft portion 3 is actually set. It is shown larger than the interdental cleaning tool D. In the present embodiment, the "predetermined length" of the covering portion 41 is 10 mm to 30 mm, preferably 15 mm to 25 mm, and more preferably 15 to 20 mm.

As shown in FIG. 2, the first covering portion 411 is covered along the tapered surface 31 of the shaft portion 3. That is, the taper angle of the first covering portion 411 is the same as the taper angle θ of the tapered surface 31 of the shaft portion 3. In other words, the wall thickness of the first covering portion 411 is constant. Therefore, the outer diameter of the first covering portion 411 increases from the tip of the shaft portion 3 toward the proximal end side.

The second covering portion 412 extends from the end portion of the first covering portion 411 to the base end side via the boundary portion 413. The second covering portion 412 is covered at an angle smaller than the taper angle θ of the tapered surface 31 of the shaft portion 3. In the present embodiment, the outer peripheral surface of the second covering portion 412 is formed parallel to the shaft core X of the shaft portion 3. That is, the degree of diameter expansion of the second covering portion 412 in the direction from the tip of the shaft portion 3 toward the base end side is smaller than the degree of diameter expansion of the first covering portion 411 and is not expanded, and the second coating is not expanded. The wall thickness of the portion 412 becomes thinner from the boundary portion 413 toward the base end side. Here, "diameter expansion" means that the outer diameters of the first covering portion 411 and the second covering portion 412 increase from the tip of the shaft portion 3 toward the proximal end side. Further, the "diameter expansion degree" is the first covering portion 411 (or the first covering portion 411) at the end point of the line segment on the tip side, assuming a line segment having a predetermined length from the tip of the shaft portion 3 toward the base end side. 2 The degree of diameter expansion, which is how much the outer diameter of the first coating portion 411 (or the second coating portion 412) at the end point of the line segment on the base end side has increased with respect to the outer diameter of the coating portion 412). ". This "degree of diameter expansion" can be expressed by a length (difference in absolute value of outer diameter) or a ratio (ratio of difference in absolute value of outer diameter).

As described above, in the interdental cleaning tool D according to the present embodiment, the degree of expansion of the second covering portion 412 in the direction from the tip of the shaft portion 3 toward the proximal end side is larger than the degree of expansion of the first covering portion 411. Is also small, so that the outward spread of the covering portion 41 in the direction from the tip of the shaft portion 3 toward the base portion 1 is suppressed in the second covering portion 412 as compared with the first covering portion 411. As a result, even if the cleaning unit main body 4 (second covering portion 412) is lengthened, the diameter of the cleaning unit main body 4 is not extremely increased, and the entire cleaning unit main body 4 can be inserted between the teeth for cleaning. As a result, it is possible to secure a large stroke amount of the cleaning unit main body 4 that can be inserted between the teeth and enhance the cleaning ability of the interdental cleaning tool D. In particular, in the interdental cleaning tool D according to the present embodiment, since the outer peripheral surface of the second covering portion 412 is parallel to the shaft core X of the shaft portion 3, the outer diameter of the second covering portion 412 is from the tip to the base end. It does not spread outward in the direction toward the side, and no matter how long the cleaning part main body 4 (second covering part 412) is made, the entire cleaning part B can be easily inserted between the teeth for cleaning. be able to. This makes it possible to reduce the frictional resistance between the cleaning unit main body 4 and the teeth when the cleaning unit main body 4 is inserted between the teeth. Therefore, even if the cleaning unit main body 4 is lengthened, cleaning is performed during cleaning. It is possible to prevent a part of the main body 4 from being torn and broken.

In the interdental cleaning tool D according to the present embodiment, since it is not necessary to reduce the outer diameter of the shaft portion 3 in order to increase the stroke amount of the cleaning portion main body 4, it is necessary as the cleaning portion B of the interdental cleaning tool D. Strength can be maintained. Further, since it is not necessary to reduce the wall thickness of the covering portion 41 as a whole, the entire cleaning portion main body 4 including the covering portion 41 can be filled with the elastomer.

In the interdental cleaning tool D according to the present embodiment, the wall thickness of the second covering portion 412 gradually decreases from the boundary portion 413 toward the proximal end side, so that the material cost of the elastomer can be reduced. Further, the outer diameter of the second covering portion 412 is not increased in accordance with the taper angle θ of the tapered surface 31. Since the first covering portion 411 and the second covering portion 412 are formed on the tapered surface 31 which is a linear taper, the cleaning portion main body 4 can be formed in close contact with the shaft portion 3.

[Modified example of the first embodiment]
Next, the interdental cleaning tool D according to the modified example of the first embodiment of the present invention will be described with reference to FIG. In this modification, only the shapes of the shaft portion 3 and the covering portion 41 of the cleaning portion main body 4 are different from those of the first embodiment, and other configurations are the same as those of the first embodiment.

Unlike the first embodiment, the shaft portion 3 of the interdental cleaning tool D according to this modification is parallel to the shaft core X along the second direction Xb (toward the tip) from the connection portion with the bent portion 2. A cylindrical portion having a parallel surface 32, which is an outer peripheral surface, and a tapered conical base rod-shaped portion having a tapered surface 31 whose diameter is further reduced (reduced in diameter) at a constant rate toward the tip. have.

The covering portion 41 of the cleaning portion main body 4 of the interdental cleaning tool D according to this modification has a uniform wall thickness over the entire surface. That is, the wall thickness of the first covering portion 411 formed on the tapered surface 31 of the shaft portion 3 and the wall thickness of the second covering portion 412 formed on the parallel surface 32 are the same thickness, and the thickness of the second covering portion 412 is the same. The wall thickness is the same from the boundary portion 413 toward the base end side. In other words, the parallel surface 32 of the shaft portion 3 and the outer peripheral surface of the second covering portion 412 are parallel to the shaft core X of the shaft portion 3. Also in this modified example, in order to facilitate understanding of the structure of the cleaning portion main body 4, in FIG. 3, the taper angle θ of the tapered surface 31 of the shaft portion 3, that is, the tapered surface 31 with respect to the shaft core X of the shaft portion 3 The inclination of is larger than that of the actual interdental cleaning tool D. Also in this modification, the "predetermined length" of the covering portion 41 is 10 mm to 30 mm, preferably 15 mm to 25 mm, and more preferably 15 to 20 mm.

As described above, in the interdental cleaning tool D according to the present modification, since the parallel surface 32 of the shaft portion 3 and the outer peripheral surface of the second covering portion 412 are parallel to the shaft core X of the shaft portion 3, the second The covering portion 412 does not spread outward even from the boundary portion 413 toward the base end side, and no matter how long the cleaning portion main body 4 (second covering portion 412) is lengthened, the entire cleaning portion B can be covered. It can be easily inserted between teeth for cleaning. Further, since the frictional resistance between the cleaning unit main body 4 and the teeth when the cleaning unit B is inserted between the teeth can be reduced, a part of the cleaning unit main body 4 is torn and broken during cleaning. Can be suppressed. Further, since the shaft portion 3 has a cylindrical portion, the strength required for the cleaning portion B can be maintained.

[Other Embodiments]
(A) In the interdental cleaning tool D according to the first embodiment and its modified example, the outer diameter of the second covering portion 412 was parallel to the shaft core X of the shaft portion 3, but the first covering portion 411 If the degree of diameter expansion of the second covering portion 412 is smaller than the degree of diameter expansion, the second covering portion 412 may have a shape in which the diameter is increased from the boundary portion 413 toward the base end side. Even if the cleaning portion main body 4 has such a shape, it is compared with a shape having a second covering portion 412 whose diameter is increased at the same taper angle as the first covering portion 411 in the direction from the tip end side of the shaft portion 3 toward the proximal end side. As a result, the outer spread of the second covering portion 412 is suppressed, so that even if the cleaning portion main body 4 is lengthened, the entire cleaning portion main body 4 can be inserted between the teeth for cleaning.

(B) In the interdental cleaning tool D according to the first embodiment, the outer peripheral surface of the shaft portion 3 covered with the second covering portion 412 is a boundary portion 413 from the connection portion between the bent portion 2 and the shaft portion 3. It was a tapered surface 31 whose diameter decreased (reduced) at a constant rate toward the surface. Further, in the interdental cleaning tool D according to the modified example of the first embodiment, the outer peripheral surface of the shaft portion 3 covered with the second covering portion 412 is bordered from the connection portion between the bent portion 2 and the shaft portion 3. It was a parallel surface 32 parallel to the axis X of the shaft portion 3 toward the portion 413. However, as long as the degree of expansion of the second covering portion 412 in the direction from the tip of the shaft portion 3 toward the base end side is smaller than the degree of expansion of the first covering portion 411, it is covered with the second covering portion 412. The outer peripheral surface of the shaft portion 3 may be a tapered surface whose diameter increases (diameters) at a constant rate from the connection portion between the bent portion 2 and the shaft portion 3 toward the boundary portion 413. With such a configuration, it is possible to provide an interdental cleaning tool having a cleaning portion B having a more elastic force.

(C) As shown in FIG. 4, the interdental cleaning tool D does not have the bent portion 2 of the first embodiment, and the base portion 1 and the shaft portion 3 having the grip portion 11 and the extending portion 12 are formed. It may be composed of an integrally molded linear main body A. In the interdental cleaning tool D according to the present embodiment, the cleaning portion main body 4 is formed only in a part (an example of a predetermined length) from the tip of the shaft portion 3. At this time, the shapes of the shaft portion 3 and the cleaning portion main body 4 can be any of the above-described first embodiment, a modified example thereof, and other other embodiments (a). As described above, if the shapes of the shaft portion 3 and the cleaning portion main body 4 are as described above, the shape of the main body A is arbitrary.

The present invention can be used as an interdental cleaning tool for cleaning the interdental space of molars.

1: Base part 3: Shaft part 4: Cleaning part main body 5: Back part 11: Grip part 12: Extension part 41: Covering part 42: Brush part 411: First covering part 412: Second covering part A: Main body D: Interdental cleaning tool

Claims (4)

A main body having a base portion and a shaft portion arranged on the side of one end of the base portion, and
A cleaning unit main body made of an elastic material having a hardness lower than the hardness of the main body, covering a predetermined length from the tip of the shaft portion to the base portion, and having an outer shape that can be inserted between teeth is provided.
The cleaning unit main body includes a covering portion that is in close contact with the entire circumference of the shaft portion having the predetermined length, and a brush portion having a plurality of bristles protruding outward from the covering portion.
In the covering portion, the first coating portion and the second coating portion are arranged in this order from the tip to the base portion.
The second covering portion is an interdental cleaning tool in which the degree of diameter expansion in the direction from the tip toward the base portion is smaller than the degree of diameter expansion of the first coating portion. The interdental cleaning tool according to claim 1, wherein the portion of the shaft portion of the main body covered with the cleaning portion main body has a linear taper from the base portion toward the tip end. The interdental space according to claim 1, wherein the portion of the shaft portion of the main body covered with the second coating portion and the outer peripheral surface of the second coating portion are parallel to the axis of the shaft portion. Cleaning tool. The interdental cleaning tool according to claim 1 or 2, wherein the wall thickness of the second covering portion gradually decreases in the direction from the tip to the base.

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