JP2002336049A - Toothbrush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toothbrush which fits to the hand, is easily grippable, can surely exhibit a nonslip effect in spite of changing the direction of holding its handle and is good in the feel of contact with the hand and fingers. SOLUTION: The toothbrush of which the length L5 of a grip 5 is >=1/2 the overall length L of the handle is set with the position of the maximum width Wmax and/or maximum thickness Dmax of the grip 5 within a range of 30 to 70% from the neck side of the overall length L5 of the grip and/or is set in the ratio of the max. width Wmax and/or the maximum thickness Dmax and L5 to 0.1 to 0.2. The shape line smoothly connecting the external form shape of the handle has a shape at which its width and/or thickness is partially smaller within the range of the neck side 1/2 of the grip 5. The ratio of the width Wmin and/or thickness Dmin and maximum width Wmax and/or thickness Dmax of the gradually smaller shape segment is specified to 0.5 to 0.95 in comparing with the width and/or the thickness to each other. Further, a nonslip portion 6 made of an elastic body consisting of rugged parts is formed in the neck side boundary position of the grip 5 and the length in the circumferential direction of the rugged parts is specified to >=50% of the circumferential length of the grip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush which can hold a finger firmly and stably without slipping even when a grip portion is wet with water, saliva, dentifrice, etc. during brushing, and is easy to brush. .

[0002]

2. Description of the Related Art It is known to provide an enormous portion in a grip portion of a toothbrush handle (for example, Japanese Patent Application Laid-Open No. 11-5119).
98, JP-A-61-199232, and JP-A-60-146426.

It is also known to provide a non-slip near the boundary of the grip on the neck side (JP-A-7-327737, JP-A-6-15426, JP-A-63-2630).
3608, JP-A-55-166107, JP-A-62-92719, JP-A-61-19923.
No. 2, JP-A-55-69423, JP-A-54-69423
-15578).

[0004]

As described above, it is known to provide an enlarged portion in the grip portion of the toothbrush handle. However, detailed specifications are not known, and it is not always easy to grip. .

It is also known to provide a non-slip near the boundary of the grip portion on the neck side. However, the anti-slip protrudes from the handle surface or is non-slip only on a specific surface. There were cases where the anti-slip function did not work if the direction was changed, and it was not always thorough.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. The present invention is easy to grasp by fitting to a hand, and can surely exhibit a non-slip effect even when the direction of holding a handle is changed. It is an object of the present invention to provide a non-slip toothbrush having a good feel.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention employs the following means. That is, in the toothbrush according to claim 1, in which the grip portion has a length equal to or longer than の of the entire length of the handle, the maximum width and / or the position of the maximum thickness of the grip portion is the neck portion of the entire grip portion. 30-70% from the side, preferably 35-65%,
More preferably, it is present in the range of 40 to 60%.

According to a second aspect of the present invention, in the invention of the first aspect, the ratio of the maximum width and / or the maximum thickness of the grip portion to the length of the grip portion is 0.1 to 0.2, preferably 0. .12 to 0.18.

According to a third aspect of the present invention, there is provided the toothbrush according to the first aspect.
Or the shape line that smoothly connects the outer shape of the handle has a shape in which the width and / or thickness is partially reduced within a range of the neck side half of the grip portion, The ratio of the width and / or thickness of the reduced shape portion to the maximum width and / or thickness is 0.5 to 0.95, preferably 0.6 to 0, as compared with each other in width and / or thickness. .9.

In the toothbrush according to the fourth aspect, a plurality of uneven portions (for example, ring-shaped unevenness or fin-shaped unevenness) formed along the longitudinal direction of the grip portion at the boundary portion on the neck side of the grip portion.
Is formed, and the circumferential length of the uneven portion is 50% or more of the circumferential length of the grip portion, preferably 70% or more, more preferably the entire circumference of the grip portion. It is characterized by having been over.

According to a fifth aspect of the present invention, there is provided the toothbrush according to the fourth aspect.
The toothbrush according to any one of the preceding claims, wherein a contour line formed by smoothly connecting the outer end surfaces of the convex portions of the uneven portions constituting the non-slip portion is flush with the outline of the grip portion connected to the non-slip portion.

According to a sixth aspect of the present invention, there is provided the toothbrush according to the fourth aspect.
Alternatively, in the invention described in Item 5, at least the uneven portion is formed of an elastic body.

[0013] The toothbrush according to the seventh aspect is the first to third aspects.
A grip portion shape of the toothbrush according to any one of claims 1 to 4, and a toothbrush.
The toothbrush according to any one of the above-mentioned items, is characterized in that it has a non-slip portion shape.

As described above, the present invention relates to a toothbrush having a grip portion having a length equal to or longer than half of the entire length of the handle, wherein the maximum width and / or the maximum thickness position of the grip portion is equal to the total length of the grip portion. 30-70% from neck side, preferably 3
Since it is made to be in the range of 5 to 65%, more preferably 40 to 60%, especially when gripped with a palm grip, unnatural force is unnecessary with the palm, middle finger, ring finger, little finger, etc., and it is smooth. It can be gripped and fits your hand. In addition,
In the case of the present invention, the boundary position between the grip portion 5 and the neck portion 4 is a neck-side distal end position of a non-slip portion formed at a neck-side boundary position of the grip portion, which will be described later.

Also, the ratio of the maximum width and / or the maximum thickness of the grip portion to the length of the grip portion is set to 0.1 to 0.2, preferably 0.12 to 0.18. Not only does it make it easier to grasp and fit, but also the design balance of the whole handle is improved, and a functional appearance impression can be obtained.

Further, the shape line which smoothly connects the outline of the handle has a shape in which the width and / or the thickness is partially reduced within the range of half of the neck side of the grip portion. The ratio of the width and / or thickness of the shaped part to the maximum width and / or the maximum thickness is such that the width and / or
Or, in comparison with the thickness, the thickness is set to 0.5 to 0.95, preferably 0.6 to 0.9, so that the thumb, the index finger and the like and the palm and the middle finger are particularly held when the palm grip is used. , The balance between the little finger and the like is improved, and the whole hand is easily fitted and gripped.

The maximum width and / or the maximum thickness of the grip portion is 12 to 20 mm in actual size, preferably 13 to 1 mm.
It is desirable to set it to 9 mm, more preferably 14 to 18 mm. With such dimensions, particularly when gripped with a palm grip, unnatural force is not required with the palm, middle finger, ring finger, little finger, or the like, and the grip fits easily.

It is desirable that the width and / or thickness of the partially reduced shape portion is 6 to 19 mm, preferably 8 to 17 mm, more preferably 10 to 15 mm in actual size. By adopting such dimensions,
Good holding with thumb, index finger, etc., easy to fit to hand and easy to grasp.

In addition, a non-slip portion comprising a plurality of uneven portions (for example, ring-shaped unevenness or fin-shaped unevenness) formed along the longitudinal direction of the grip portion is formed at a boundary portion on the neck side of the grip portion. The circumferential length of the grip portion is 50% or more of the circumferential length of the grip portion, preferably 70% or more,
More preferably, since the grip portion is continuous over the entire circumference, it acts as a non-slip for the thumb, forefinger and middle finger at the time of a commonly used palm grip or pen grip, and the controllability during brushing is improved, Stable operation of the toothbrush. Further, even if the direction of holding the handle is changed, the anti-slip effect can be sufficiently exhibited.

The uneven portions need not extend over the entire circumference. In such a case, the circumferential lengths of the uneven portions may all be the same or may be changed. Further, depending on the design of the non-slip portion, the one that covers the entire circumference and the one that is shorter than that may be combined.

In addition, since the contour line formed by smoothly connecting the outer end surfaces of the convex portions of the uneven portion constituting the anti-slip portion is connected to the outer shape of the grip portion connected to the anti-slip portion, it is unnatural. The protrusion is eliminated from the toothbrush handle, and a good anti-slip feel can be applied to the finger without breaking the handle design.

Note that the unevenness of the uneven portion is 0.1 mm in actual size.
It is desirably 3 to 2.0 mm, preferably 0.5 to 1.5 mm. By adopting such dimensions,
Both the feel to the fingers and the anti-slip effect are good specifications. Usually, this unevenness step is often constant over the entire non-slip portion, but need not always be constant,
Different steps may be provided depending on the location according to the handle design. Furthermore, if the unevenness is too large relative to the handle diameter (thickness and / or width) of the non-slip portion, the mechanical strength is weakened. It is good to be 5.0 mm or more, preferably 6.0 mm or more.

The thickness (collar thickness) of the projections in the handle in the longitudinal direction of the handle is 0.5 to 2.0 mm, preferably 0.7 to 1.5 mm. With such a thickness, both the feel to the fingers and the anti-slip effect are further improved. If this thickness differs between the base side and the tip side of the anti-slip portion, it is determined as an average thickness.

If the convex portion of the concave and convex portion is provided with a draft taper (taper angle = 1 to 10 °) for forming the handle, the formability is improved. Further, the tip edge of the convex portion may be formed into an arc-shaped curved surface, or may have a corner R. It is preferable that the cross-sectional shape and thickness of the uneven portion is constant over the entire non-slip portion, but it is not necessarily constant, and the cross-sectional shape and thickness may be changed depending on the location according to the handle design. Good.

The uneven pitch of the uneven portion along the longitudinal direction of the grip portion is 1.0 to 4.0 mm, and preferably 1.5 to 4.0 mm.
Ｍｍ3.0 mm. With such a pitch, both the feel to the fingers and the anti-slip effect are good.
It is preferable that the uneven pitch is constant over the entire non-slip portion. However, the pitch is not necessarily constant, and may be different depending on the location of the handle in accordance with the handle design.

The overall length of the uneven portion in the longitudinal direction of the grip portion is not particularly limited, and may be at least 5 mm or more, preferably 10 mm or more, more preferably 15 mm or more so that a finger can be efficiently touched. In consideration of the overall balance, it is most preferable to set the grip to 4 to 30%.

From the design point of view, it is preferable that the uneven portion has a different color (including transparent or resin natural) from the other handle portions, and may be formed of the same material or different materials. .

When at least the uneven portion is made of an elastic material, for example, a thermoplastic elastomer or silicon,
Both the feel to the fingers and the anti-slip effect are better.
There are no particular restrictions on the type of thermoplastic elastomer (olefin-based, styrene-based, urethane-based, nylon-based, etc.) or silicone resin, but its hardness is 5 to 70 (JIS K6).
301, test conditions A), preferably those of 20 to 65, provide good elasticity and better usability.

When the handle is manufactured by injection molding, if the direction of the convex portion of the uneven portion constituting the anti-slip portion is set to be substantially parallel to the mold opening direction, the mold opening and the molding during the manufacture of the handle are performed. The mold release becomes smooth, and the moldability during production is improved. Furthermore, in the case of flat-line flocking, the direction is substantially parallel to the direction of the flocking pin, and in the case of in-mold flocking in which the bristle is fixed together during injection molding, the direction is substantially parallel to the direction of the bristle bundle. Then, the mold mechanism does not have to be complicated.

As the material of the brush (filament) constituting the hair bundle, commonly used polyamides (eg, nylon 6-12, nylon 6-10, 12 nylon, etc.), polyesters (eg, polybutylene terephthalate, Polyethylene terephthalate, etc.) and polypropylene. Further, a composite filament obtained by combining these may be used.

The brush thickness is 3 to 12 mils (0.076 to
0.305 mm), preferably 5-11 mils (0.12 mm
7 to 0.279 mm), and usually a rounded tip is used.

In general, the diameter of a single brush is the same except for the rounded portion of the bristle. However, even in the vicinity of the root of the bristle, even if the brush has the above-mentioned thickness, the diameter gradually increases toward the bristle tip. It may be in the form of tapered bristles. The tip of the brush may have a spatula shape, a scraper shape, a spherical shape, or the like.

The implantation angle of the brush is not necessarily perpendicular to the implantation surface of the head portion, but may be inclined implantation in order to enhance the scraping effect in a specific direction.

The cross-sectional shape of a bristle bundle formed by bundling brushes is usually circular, but need not be circular, and may be a polygonal cross-section such as a triangle or a quadrangle.
Further, a straight line and a curve, or an irregular cross-section obtained by combining these may be used. In particular, in the case of flat-line flocking, by combining these bristle bundles having an irregular cross-section and flocking between thin-walled holes, an apparently continuous bristle bundle having a straight or curved shape can be obtained.

The brushes constituting the bristle bundle need not all have the same brush diameter, for example, 6 mils (0.152 m).
m) and 7 mils (0.177 mm), 6 mils and 8 mils (0.203 mm),
They can be appropriately selected and combined in consideration of the cleaning effect and the like. Further, a material having a different brush material may be combined, or may be combined with a rubber-like brush or chip such as silicon or an elastomer.

The brush colors need not all be the same, and transparent (including natural) hair, transparent coloring hair, opaque coloring (including white) hair, and two or more of these hairs may be used. It may be used in combination in a bundle unit or a hair bundle.

As a flocking method, a flat wire is used to fold a hair bundle into two pieces using a small piece of metal or plastic called a flat wire and implant the hair. One end of the hair bundle is melt-bonded by means of heat or the like. In-mold flocking to fill and fix the resin in the mold with the part facing the mold, heat fusion flocking to fuse and fix one end of the hair bundle and the head part flocking surface by heat, etc. Known methods can be used.

The material of the entire handle including the head portion is a thermoplastic resin, and has a flexural modulus of 500 to 300.
0 MPa (JIS K7203) is preferable, and polyolefin (polypropylene, polyethylene, etc.),
Polyester (polyethylene terephthalate, polybutylene terephthalate, etc.), polycarbonate (including blend with polyester), polyarylate (including blend with polyester), polyoxymethylene, A
S resin, ABS resin, cellulose propionate, polyamide, polyurethane, PMMA resin and the like can be used. Polyester and polypropylene are preferred in terms of cost and workability. Further, these resins may be combined with each other, a thermoplastic elastomer (olefin-based, styrene-based, urethane-based, nylon-based, etc.), a silicone resin, or the like to form a multicolor molded handle.

Further, it is preferable that the head portion is made of two or more materials having different elastic moduli so that a part or the whole of the head portion has flexibility.

[0040]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a toothbrush according to the present invention. 1 (a) is a plan view of a toothbrush handle, FIG. 1 (b) is a side view thereof, FIG. 1 (c) is a rear view thereof, and FIGS. 2 (a) to 2 (j) are FIG.
It is an expanded sectional view in each position of AA '-JJ' line in (b). FIGS. 3 and 4 show actual dimensions of the toothbrush according to this embodiment. FIG.
4C is a dimensional diagram (unit: mm) corresponding to each of FIGS. 1A to 1C, and FIGS. 4A to 4J are FIGS.
It is a dimensional drawing (unit: mm) corresponding to each figure of (j).
In each figure, 1 is a head portion, 2 is a flocked surface of the head portion 1, 3 is a flocked hole drilled in the flocked surface 2, 4 is a neck portion, 5
Is a grip. The hair bundle implanted in the hair implantation hole 3 is not shown.

In the toothbrush according to this embodiment, the head portion 1 and the grip portion 5 are connected by an elongated neck portion 4 having a substantially circular cross section (see FIG. 2B), and the grip portion connected to the neck portion 4 is formed. The portion 5 is configured as a handle portion having a substantially circular cross section in which the vicinity of the center of the grip portion swells smoothly. The grip portion 5 has a first non-slip portion 6 formed of a ring-shaped uneven portion at a boundary position with the neck portion 4.

On the other hand, a second non-slip part 7 is provided on the rear end side of the grip part 5 so as to cover a part of the front side and the back side of the grip part.
a, 7b are formed, and the non-slip portion 7b on the rear surface side is connected to the first non-slip portion 6 on the neck side by a narrow connecting portion 7c. Although not shown, the toothbrush product name, logo mark, character, etc. may be formed in the second anti-skid portions 7a and 7b in an embossed shape by a resin of a handle hard portion, if necessary. Good thing. These may be applied by a transfer seal or a hot stamp, or may be applied not only to the non-slip portion but also to other portions.

The non-slip portions 6, 7a, 7b and the connecting portion 7
“c” is made of a thermoplastic elastomer which is an elastic body, and the handle portion excluding these portions is made of a hard resin such as polyester or polypropylene, and constitutes a so-called two-color molded handle.

In the present embodiment, the external shape
Length L of the grip 5₅To
Handle length L = 1 / 24.2 mm or more of 184.23 mm
That is, in the illustrated example, L₅= 109.332mm
(About 59%) and the maximum width W_maxAnd maximum thickness D
_maxIn the range of 12 to 20 mm, that is, in the illustrated example.
Is the maximum width W_max= 17mm, maximum thickness D_max=
15 mm and the maximum width W_maxand
/ Or maximum thickness D_maxAnd the length L of the grip 5 ₅When
Is in the range of 0.1 to 0.2, that is, in the illustrated example,
W_max/ L₅ = 0.156, D_max/ L₅=
0.137.

Further, the positions L _W and L _D of the maximum width W and the maximum thickness D of the grip portion 5 are set to positions within a range of 30 to 70% from the neck 4 side of the full length of the grip portion, that is, L in the illustrated example.
_W = is set to _{L D = 51.711mm (47.3%)} .

Further, the shape line that smoothly connects the outer shape of the handle has a shape in which the width and / or thickness is partially reduced within a range of half of the neck side of the grip portion 5,
The width W _min and / or thickness D _min of the reduced shape portion is in the range of 6 to 19 mm, that is, in the illustrated example, width W _min = 12 mm and thickness D _min = 12.
09 mm and the width W _min and / or the thickness D
The ratio of _min to the maximum width W _max and / or the maximum thickness D _max is in the range of 0.5 to 0.95, that is, W _min / W _{max in the} illustrated example, as compared with each other in width and / or thickness. = 0.71, D _min / D
It is assumed that _max = 0.81.

First non-slip portion 6 composed of uneven portions
Is 50% of the circumference of the grip 5
The above-mentioned length, that is, in the illustrated example, it is a ring-shaped uneven portion that goes around the grip portion 5, and the uneven step d of the uneven portion
Is in the range of 0.3 to 2.0 mm, that is, d in the illustrated example.
= 1.0 mm, and the contour line that smoothly connects the convex outer end surfaces of the concave and convex portions is flush with the contour of the grip portion 5 connected to the anti-slip portion 6.

The thickness (collar thickness) of the projections in the handle in the longitudinal direction of the handle is 0.5 to 2.0 mm.
, That is, about 1.1 mm in the illustrated example. Further, the uneven pitch P of the uneven portion along the grip portion longitudinal direction is in a range of 1.0 to 4.0 mm, that is, P = 2.283 mm in the illustrated example. In addition, a draft taper (taper angle of 5 °) for improving the formability is provided at the outer edge of the projection.

In the case of the toothbrush according to the above embodiment, the maximum width and the maximum thickness position of the grip portion 5 are about 59% from the neck 4 side of the full length L of the grip portion. In addition, an unnatural force is unnecessary with the palm, middle finger, ring finger, little finger, etc., so that the hand can be smoothly gripped, so that it fits the hand well.

The maximum width W of the grip 5_MAXYou
And / or maximum thickness D_MAXAnd the length L of the grip 5
The ratio of W_max/ L₅= 0.156, D_max
/ L ₅= 0.137, so as described above,
Not only fits easily and is easy to grasp, but also handles
The overall design balance is also good and a functional appearance mark
Can be an elephant.

Also, the outline of the handle was smoothly tied.
The width of the shape line is within the range of 1/2 of the neck side of the grip 5
And / or has a shape in which the thickness is partially reduced,
The width W of the reduced shape portion_minAnd / or thickness
Only D_minAnd the maximum width W _MAXAnd / or most
Large thickness D_MAXIs the width and / or thickness of each other
W_min/ W_max= 0.71, D
_min/ D_max= 0.81, so especially palm
When holding with the grip, hold the thumb, index finger, etc.
The balance between the palm, middle finger, little finger, etc. is improved,
It fits easily on your body and makes it easier to hold.

The maximum width W _{MAX of the} grip portion 5 is:
Since 17 mm and the maximum thickness D _max = 15 mm,
Especially when gripping with palm grip, palm, middle finger, ring finger,
Unnatural force is not required with the little finger, etc., so it can be gripped smoothly and fits well with the hand.

[0053] The width _W min = 12 mm of the partially reduced form part, the thickness _{D mi} n = 12.09
mm, it is easily held by thumb, index finger, etc., fits easily to the hand, and is easy to grasp.

A non-slip portion 6 composed of a plurality of concave and convex portions formed along the longitudinal direction of the grip portion is formed at the neck-side boundary position of the grip portion 5, and a ring-like shape is formed around the concave and convex portion around the grip portion. Because of the unevenness, it acts as a slip stopper for the thumb, index finger, middle finger, and the like in the case of a commonly used palm grip or pen grip, improving controllability during brushing and stabilizing the operation of the toothbrush. Further, even if the direction of holding the handle is changed, the anti-slip effect can be sufficiently exhibited.

A contour line that smoothly connects the outer end surfaces of the convex portions of the uneven portions constituting the anti-slip portion 6 is formed by the anti-slip portion 6.
Since it is formed so as to be flush with the outline of the grip portion 5 connected to the handle, unnatural protrusions are eliminated, and it is possible to provide a good anti-slip feel with a touch on the fingers without breaking the design shape of the handle.

The unevenness d of the uneven portion is 1.0 m.
m, both the feel to the fingers and the anti-slip effect are good specifications.

Further, since the uneven pitch P of the uneven portion along the longitudinal direction of the grip portion is set to 2.283 mm, both the feel to the fingers and the effect of preventing slipping are improved.

Although the embodiment of the present invention has been described in detail, the present invention is not limited to this embodiment, and various changes can be made within the gist of the invention.

[0059]

As described above, according to the present invention,
Even if the grip is wet with water, saliva, dentifrice, etc. during brushing, it can be held firmly and stably without slipping, and a toothbrush that can be easily brushed can be obtained.

[Brief description of the drawings]

1 shows an embodiment of a toothbrush of the present invention, wherein (a) is a plan view, (b) is a side view, and (c) is a rear view.

2 (a) to 2 (j) are AA ′ to J in FIG. 1 (b).
It is an expanded sectional view in each position of -J 'line.

FIGS. 3 (a) to 3 (c) are dimensional diagrams corresponding to FIGS. 1 (a) to 1 (c).

FIGS. 4A to 4J are dimensional diagrams corresponding to FIGS. 2A to 2J.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head part 2 Flooding surface 3 Flooding hole 4 Neck 5 Grip part 6 First non-slip part 7a, 7b Second non-slip part 7c Connecting part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takao Kato 3-7-7 Honjo, Sumida-ku, Tokyo F-term in Lion Corporation (reference) 3B202 AA06 AB15 BC05 BE13 CA02 DB01 EA01

Claims (7)

[Claims] 1. A toothbrush having a grip portion having a length (L ₅ ) equal to or more than の of a full length (L) of a handle, wherein the grip portion has a maximum width (W _max ) and / or a maximum thickness (D). toothbrush characterized by the presence of the neck side of the grip portion total length position of _{max) (L 5)} in the range of 30% to 70%. 2. A maximum width (W _max ) and / or a maximum thickness (D _max ) of the grip portion and a length (L) of the grip portion.
Toothbrush according to claim _{1, wherein 5)} the ratio of the is characterized in that 0.1 to 0.2. 3. A shape line in which the outline of the handle is smoothly connected has a shape in which the width and / or thickness is partially reduced within a range of the neck side half of the grip portion, and the shape line is small. The ratio of the width (W _min ) and / or the thickness (D _min ) of the shaped part to the maximum width (W _max ) and / or the thickness (D _max ) is 0 in comparison with each other in width and / or thickness. The toothbrush according to claim 1, wherein the toothbrush has a thickness of 0.5 to 0.95. 4. A non-slip portion comprising a plurality of uneven portions formed along the longitudinal direction of the grip portion is formed at the neck side boundary position of the grip portion, and the length of the uneven portion in the circumferential direction is equal to the grip portion. A toothbrush comprising at least 50% of the circumference. 5. A contour line formed by smoothly connecting the outer end surfaces of the convex portions of the concave and convex portions forming the non-slip portion is flush with the outline of the grip portion connected to the non-slip portion. Item 5. The toothbrush according to item 4. 6. The toothbrush according to claim 4, wherein at least the uneven portion is made of an elastic body. 7. A toothbrush having a grip portion shape of the toothbrush according to any one of claims 1 to 3 and a non-slip portion shape of the toothbrush according to any one of claims 4 to 6.