Underwear

Abstract

To provide underwear for supporting a posture which can support the posture of a wearer in a standing position and a sitting position and is excellent in use feeling.SOLUTION: Underwear comprises a stretchable bodice 1, and a waist holding part 2 for holding the bodice 1 on the waist position of the wearer. The bodice 1 has a front bodice 11, a back bodice 12 continuous with the front bodice 11, and a crotch bodice 13 for connecting the front bodice 11 and the back bodice 12 at a crotch position of the wearer. A stretching part 3 for controlling a degree of the expansion / contraction of the bodice 1 is disposed at a predetermined position. The stretching part 3 has a spine stretching part 31 for connecting the crotch bodice 13 with the waist holding part 2 on the back bodice 12. The spine stretching part 31 includes an elastic band 311 which is disposed along the spine of the wearer when the underwear is worn and has higher elasticity than the back bodice 12.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to underwear used for improving body functions including posture.

Background Art

[0002] When walking for a long time or staying in a standing or sitting position for a long time, excessive burden is imposed on the lumbar spine, which may lead to spinal stenosis or lumbar disc herniation. In view of such problems, various types of underwear have been developed which are provided with elastic members to fix the degree of curvature of the lumbar spine and correct the spine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The document described in Patent Document 1 describes that a yoke member made of a power net is provided at the back body of the underwear to contribute to the improvement of posture. However, since this yoke member covers substantially the entire side and back body of the underwear to fix around the pelvis, the wearing comfort is not very good due to tightening.

[0005] In view of the above problems, an object of the present invention is to provide underwear for improving body functions including posture, which can support the posture of a user during walking, standing, and sitting and has excellent wearing comfort.

Means for Solving the Problems

[0006] The present invention for solving the above problems is an undergarment comprising a stretchable body, and a waist holding part for holding the body at the waist position of a user, wherein the body has a front body, a rear body continuous with the front body, and a crotch body connecting the front body and the rear body at the crotch position of the user, and a stretching part for controlling the degree of stretch of the body is disposed at a predetermined position. The stretching part has a spinal stretching part connecting the crotch body and the waist holding part above the rear body, and the spinal stretching part is disposed along the spine of the user when worn, and is an undergarment including an elastic band having higher elasticity than the rear body. By disposing the spinal stretching part in this way, the degree of stretch is changed respectively in the standing position and the sitting position, so that it is possible to support the posture of the user according to the body posture, and an undergarment for improving the body function including a posture with excellent usability is provided.

[0007] In a preferred form of the present invention, the spinal stretching part includes a branch band connecting the middle of the elastic band and the waist holding part, and the stretching part has a lower abdomen stretching part disposed so as to cover the lower abdomen of the user in the front body. Further, the stretching part has a lower abdomen stretching part disposed so as to cover the lower abdomen of the user in the front body. Furthermore, the stretching part has a connecting stretching part connecting the crotch body and the lower abdomen stretching part. In addition, the connecting stretching part branches midway and includes a branch connecting part extending from the branch point toward the waist holding part. In this way, a plurality of stretching parts are provided at predetermined positions on the body so as to cooperate with each other, so that effective stretching is performed, the overall tightening is suppressed, and the posture can be effectively supported.

[0008] In a preferred form of the present invention, the waist holding part is disposed so as to surround the upper end of the body whose upper end is cylindrical, and has a high-elasticity holding part and a low-elasticity holding part provided in a part of the front body and having lower elasticity than the high-elasticity holding part. Further, the stretching part has a lower abdomen stretching part disposed so as to cover the lower abdomen of the user in the front body, and the low-elasticity holding part is provided integrally with the lower abdomen stretching part. With such a configuration, while holding around the waist, it is possible to reduce the burden on the waist of the user and support a posture with excellent usability.

Effect of the Invention

[0009] The present invention that solves the above problems can support the posture of the user during walking, standing, and sitting, and can provide an undergarment for improving physical functions including a posture with excellent usability.

Brief Explanation of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0011] Hereinafter, the undergarment X according to each embodiment of the present invention will be described with reference to the drawings. The description will be detailed in the order of the configuration of the embodiment, the method of implementation, and other examples. Note that the embodiments shown below are examples of the present invention, and the present invention is not limited to the following embodiments. Also, "rounded" in the application documents means that chamfering or rounding is performed on the subsequent shape, and that the elements constituting the shape are deformed or the length is changed within a range that does not hinder the purpose of the configuration. Further, "elasticity" in this specification represents the property of expanding and contracting when a force is applied, and "elastic height" means the elastic modulus of the part, and the higher it is, the greater the force required for expansion and contraction from the natural length. In these figures, since the expansion / contraction part 3 is actually provided on the back surface and thus not visible, it is shown as being on the front surface.

[0012] 《First Embodiment》 As shown in FIG. 1, the undergarment X is an undergarment including an elastic body 1 and a waist holding part 2 that holds the body 1 at the user's waist position. The body 1 has a front body 11, a back body 12 continuous with the front body 11, and a crotch body 13 that connects the front body 11 and the back body 12 at the user's crotch position. An expansion / contraction part 3 for controlling the degree of expansion / contraction of the body 1 is disposed at a predetermined position. The expansion / contraction part 3 has a spinal expansion / contraction part 31 that connects the crotch body 13 and the waist holding part 2 above the back body 12. The spinal expansion / contraction part 31 includes an elastic band 311 that is arranged along the user's spine when worn and has higher elasticity than the back body 12. Note that FIG. 1(a) represents a perspective view of the front body side of the undergarment X, and FIG. 1(b) represents a perspective view of the back body side.

[0013] The body 1 is an elastic fabric material that constitutes so-called pants, and has a front body 11 that covers the user's ventral side, a back body 12 that is connected to the front body 11 and covers the user's buttocks side, and a crotch body 13 that connects the front body 11 and the back body 12 and covers the user's crotch position. Here, the side connecting the front body 11 and the back body 12 is defined as the body connection side 14. In the embodiment, the body 1 is in the shape of shorts and is provided so as to cover a part of the user's thighs.

[0014] The waist holding part 2 is an elastic member that is connected to the upper end of the body 1 and is provided so as to surround the waist and go around once. The waist holding part 2 has a high-elasticity holding part 21 and a low-elasticity holding part 22 that has lower elasticity than the high-elasticity holding part 21 in order to reduce constriction.

[0015] The stretchable part 3 is an elastic member attached to a predetermined position of the body 1 as shown in FIG. 2, and in the underwear X, it is a part with higher elasticity than a single body 1. As materials for the stretchable part 3 to be attached, various members that can enhance the elasticity of that part by overlapping with the body 1 are envisioned, such as sheet materials like mesh or power net that are more elastic than the fabric of the body 1, strip-shaped elastic members containing elastic threads or rubber, and elastic fabrics forming the body 1. These members may be attached in duplicate. Note that in the back surface of the underwear X, FIG. 2 represents a schematic diagram of a developed view in a state where the front body 11 and the back body 12 are connected only on one side and the crotch body 13 is separated.

[0016] In the embodiment, the stretchable part 3 is joined to the body 1 by being sewn. Here, the stretchable part 3 is joined to the body 1 by zigzag stitching along the edge of the sheet material or the axial direction (the direction in which it stretches and contracts) of the strip-shaped elastic member, so that the elasticity of the stretchable part 3 can be reliably transmitted to the body 1. Also, the stretchable part 3 may be provided on the back surface of the body 1 and formed of a part with a stronger frictional force against the skin than the body 1 to further enhance the elastic transmission efficiency.

[0017] The stretchable part 3 is an elastic member arranged at a predetermined position of the body 1, which is at its natural length when not in use and is provided to stretch and contract according to the shape around the user's waist during use. The stretchable part 3 includes a spinal stretchable part 31 that supports the muscles (for example, the multifidus muscle) around the user's spine, a lower abdominal stretchable part 32 that supports the muscles (for example, the transverse abdominal muscle) of the user's lower abdomen during wearing in the front body 11, and a connecting stretchable part 33 that connects the front body 11 and the back body 12 and assists the actions of the spinal stretchable part 31 and the lower abdominal stretchable part 32. In this way, since the stretchable part 3 does not cover the entire body 1 and is provided separately at a plurality of sites, the underwear X can provide good comfort without tightly squeezing the user.

[0018] In the front body part 11, as shown in Fig. 3(a), it includes a folded-back part 111, and a lower abdomen expansion and contraction part 32 is provided below it. Also, in the back body part 12, as shown in Fig. 3(b), a spine expansion and contraction part 31 extends straight from the center of the waist holding part 2 toward the thigh body part 13, and a connecting expansion and contraction part 33 is provided so as to surround the periphery thereof. Further, the connecting expansion and contraction part 33 extends from the body side connecting edge 14 toward the crotch side 121 and the waist holding part 2 which will be described later. Note that the folded-back part 111 also functions as a low-elasticity holding part 22.

[0019] The folded-back part 111 is a part where the side at the upper end of the front body part 11 is folded back and overlapped at a predetermined position, and the end of the fold is connected to the front body part 11 so that the body part 1 is doubled, and it is provided so that its elasticity is lower than that of the high-elasticity holding part 21. It is preferable that the width of the fold of the folded-back part 111 is larger than the width of the high-elasticity holding part 21 to make the elasticity lower.

[0020] The back body part 12 has a boomerang-like shape and includes a plurality of edge sides. On this edge side, there are a body side connecting edge 14 provided on the side surface and connected to the front body part 11, a crotch side 121 which is a curved edge side located along the crotch and inner thigh of the user during use, and a substantially straight opening side 122 which becomes an opening end side covering the user's ankle during use.

[0021] The thigh body part 13 is a substantially rectangular member as shown in Fig. 2 and abuts on the user's thigh. A crotch may be provided on its inner peripheral surface so that the user can directly wear it. By directly wearing it, it is preferable because the expansion and contraction action of the expansion and contraction part 3 directly acts on the user's body.

[0022] One side on the short side in the thigh body part 13 is a front thigh connecting edge 131 connected to the middle of the crotch side 121 of the front body part 11, and the side opposite to the front thigh connecting edge 131 is a rear thigh connecting edge 132 connected to the middle of the crotch side 121 of the back body part 12. Also, the side in the longitudinal direction is a machi side 133 that connects to the part where the front body part 11 and the back body part 12 of the body side connecting edge 14 are not connected to form a machi of the body part 1.

[0023] The crotch side 121 is an arcuate portion provided at both ends and the center of the back body 12, and is curved. The crotch sides 121 provided at both ends of the back body 12 are connected to the crotch side 121 provided at the center of the back body 12 near the opening side 122, and the other parts are connected to the front crotch connecting side 131. Also, the crotch side 121 located at the center of the back body 12 is connected to the crotch sides 121 provided at both ends near the opening side 122, and the other parts are connected to the back crotch connecting side 132.

[0024] The opening side 122 is an edge portion provided on the end face of the body 1 facing the waist holding portion 2, and extends from the end of the crotch side 121 of the front body 11 to the end of the crotch side 121 of the back body 12. The opening side 122 is not sewn, which makes it difficult to form a step between the foot during use, so the wearing comfort as underwear can be improved.

[0025] The body connecting side 14 is an edge portion extending from the side portion of the front body 11 and the waist holding portion 2 of the back body 12 to the crotch side 121, and is connected to the low-elasticity holding portion 22, the lower abdomen elastic portion 32, the overlapping body 1 and the gusset side 133 respectively. It should be noted that the connection of the above-mentioned crotch side 121 and the body connecting side 14 is preferably performed through an elastic band material (which may be a string material) or stitched in a zigzag manner so as not to inhibit the elasticity of the body 1.

[0026] The high-elasticity holding portion 21 is an elastic belt-like member provided so as to surround the waist at the edge of the back body 12. The low-elasticity holding portion 22 is connected to both ends of the high-elasticity holding portion 21 at the edge of the front body 11 and is disposed at a position hitting the user's abdomen. In this way, by providing a difference in elasticity in the waist holding portion 2, while firmly holding the waist, it is difficult to burden the user's abdomen, and the usability can be enhanced.

[0027] The spine elastic portion 31 has an elastic band 311 which is a belt-like elastic member provided on the back body 12 and extending from the crotch body 13 toward the waist holding portion 2, and a branch band 312 which is a belt-like elastic member connecting the middle of the elastic band 311 and the waist holding portion 2. In addition, the spinal stretching part 31 includes a plurality of elastic sheet materials for reinforcing the plurality of bands described above. In the embodiment, a parallel sheet 313 which is a strip-shaped elastic member provided along both sides of the elastic band 311, a branch sheet 314 provided between the elastic band 311 and the branch band 312, and a crotch sheet 315 provided so as to cover the crotch side 121 from below the parallel sheet 313 are included.

[0028] The elastic band 311 is a strip-shaped elastic member that extends vertically from the center in the back body part 12 of the waist holding part 2 toward the crotch body part 13, and connects the waist holding part 2 and the crotch body part 13 at the shortest distance. By connecting at the shortest distance in this way, the elasticity can be exerted regardless of the posture of the user. Also, during use, since the elastic band 311 is along the user's spine, the lower part of the spine contracts so as to bend forward. Here, the elasticity of the elastic band 311 is set to be at least higher than that of the back body part 12, preferably the highest in the spinal stretching part 31, and more preferably the highest in the stretching part 3 so as to support the spine.

[0029] The branch bands 312 are provided one by one symmetrically on the left and right in the back body part 12, and are strip-shaped elastic members whose one end is connected to the middle of the elastic band 311 and the other end is connected to a position away from the center when viewed from the back body part 12 of the waist holding part 2. The connection position with the elastic band 311 is a position about 2 / 5 below from the waist holding part 2 with respect to the entire axial direction of the elastic band 311, and the angle formed by the elastic band 311 and the branch band 312 is about 20° to 40°. By providing the branch bands 312 in this way, a force acts in the direction of returning to the upright position when the body leans to the side, and the posture can be improved. Also, due to the branch bands 312, the expansion and contraction of the elastic band 311 acts on the contraction of the waist holding part 2, and in particular, the holding force on the waist can be increased when the elastic band 311 extends. Also, the elasticity of the branch bands 312 is lower than that of the elastic band 311, and the expansion and contraction is more likely to occur than that of the elastic band 311.

[0030] The parallel sheets 313 are provided one on each side symmetrically with respect to the back body 12. They are strip-shaped elastic sheet members, one end of each being connected to the end of the elastic band 311 of the branch band 312, and the other end extending to a position where it contacts the connection expansion and contraction part 33. Thereby, the parallel sheets 313 enhance durability, reinforce the elasticity of the elastic band 311, and more accurately support the spine. Also, the difference in elasticity between the upper part and the lower part of the elastic band 311 at the connection point with the branch band 312 is eliminated, enabling the elastic band 311 to expand and contract appropriately.

[0031] The branch sheets 314 are triangular elastic sheet members provided one on each side symmetrically with respect to the back body 12, and are surrounded by the elastic band 311, the branch band 312, and the waist holding part 2. The branch sheets 314 are sandwiched and stitched between the elastic band 311, the branch band 312, and the back body 12, suppressing the inadvertent expansion and contraction of the branch band 312 and the distortion of the adjacent body part 1 and enhancing the performance.

[0032] The crotch sheets 315 are elastic sheet members provided one on each side symmetrically with respect to the back body 12, and are arranged so as to surround the periphery of the crotch side 121. The crotch sheets 315 are provided continuously from the lower end of the parallel sheets 313 and are also connected to the lower end part of the elastic band 311. Further, the crotch sheets 315 are connected to the crotch side 121 from the center of the crotch side 121 to the vicinity of the opening side 122. A part of the crotch sheets 315 overlaps with the connection expansion and contraction part 33, and the non-overlapping part forms a substantially triangular part with a part of the connection expansion and contraction part 33 and a part of the crotch side 121 as two sides. By connecting the spine expansion and contraction part 31 to the crotch side 121 in a wide area, the posture can be improved by applying the spine expansion and contraction part 31 from the inner thigh and lifting the buttocks.

[0033] The lower abdomen expansion and contraction part 32 is a member provided in the front body 11 in a substantially inverted trapezoidal shape facing the thigh body part 13, and has a lower abdomen sheet 321 that lifts the lower abdomen from below. The lower abdomen expansion and contraction part 32 has its lower side connected to the thigh body part 13 and its side sides connected to the body part connection side 14. Also, a highly elastic holding part 21 is provided on the upper side so as to sandwich the folded-back part 111.

[0034] The lower abdominal sheet 321 is a substantially trapezoidal member, which is connected directly below the folded-back portion 111 and is connected by the overlapping body 1, the elastic body connection side 14, and the gusset side 133. Also, its side is connected to the connection expansion / contraction portion 33. The member of the lower abdominal sheet 321 is the same as that of the connection expansion / contraction portion 33 and has the same elasticity.

[0035] As shown in FIG. 4, the lower abdominal expansion / contraction portion 32 may be provided with a pocket portion 322 for storing the male genitalia on the crotch body 13 side of the lower abdominal sheet 321. That is, the pocket portion 322 is surrounded by the lower abdominal sheet 321, the body connection side 14, and the gusset side 133 at its periphery.

[0036] The pocket portion 322 has an elastic dividing line in a direction perpendicular to the waist holding portion 2. This dividing line is longer than the length in plan view and has a clearance from the inner peripheral surface. This clearance creates a clearance between the pocket portion 322 and the body, allowing the male genitalia to be held without being tightened.

[0037] The connection expansion / contraction portion 33 is an elastic sheet material disposed on the back body 12 and connects the front body 11 and the crotch body 13. Also, since the front body 11 includes the lower abdominal expansion / contraction portion 32, the connection expansion / contraction portion 33 connects the crotch body 13 and the lower abdominal expansion / contraction portion 32.

[0038] The connection expansion / contraction portion 33 has a connection expansion / contraction portion main body 331 extending from the front body 11 to the crotch body 13 and a branch connection portion 332 branching from the connection expansion / contraction portion main body 331 and connecting to the waist holding portion 2. Also, in the connection expansion / contraction portion 33, the edge connecting from the crotch body 13 to the waist holding portion 2 is defined as the hip edge 333, the edge connecting from the crotch body 13 to the lower abdominal expansion / contraction portion 32 is defined as the lower edge 334, and the edge connecting from the waist holding portion 2 to the lower abdominal expansion / contraction portion 32 is defined as the upper edge 335. The connection expansion / contraction portion 33 is sewn to the back body 12 in a zigzag manner in the vicinity of these edges.

[0039] One end of the connecting telescopic part main body 331 is connected to the front body part 11. Since the end of the connecting telescopic part main body 331 is adjacent to the lower abdomen telescopic part 32, it substantially pulls the lower abdomen telescopic part 32. The other end is connected to the thigh body part 13, and a part of the thigh seat 315 overlaps with the seat. Here, in the connecting telescopic part main body 331, the connection range with the thigh body part 13 is shorter than that of the thigh seat 315, but it is provided so as to be also connected to the end of the elastic band 311. Thereby, the expansion and contraction of the connecting telescopic part main body 331 changes in conjunction with the position of the thigh body part 13 and the expansion and contraction of the elastic band 311, and the pulling strength of the other telescopic parts is adjusted between the sitting position and the standing position.

[0040] The other end of the connecting telescopic part main body 331 is connected to the lower abdomen telescopic part 32 via the body main part connection side 14. Since the connection range is provided at a position away from the end of the body main part connection side 14, the connecting telescopic part main body 331 can pull the center of the lower abdomen telescopic part 32 and effectively apply pressure to the lower abdomen.

[0041] The branched connection part 332 is provided so as to branch from substantially the center of the side of the body during use. Its end is adjacent to or connected to the branched band 312 connected to the waist holding part 2, and the degree of expansion and contraction of the branched connection part 332 also changes according to the expansion and contraction of the branched band 312.

[0042] The buttocks edge 333 is provided so as to be arc-shaped in a rear view so as to surround the gluteal muscles of the user, and is arranged to surround and lift the gluteal muscles of the user during use. Thereby, the buttocks of the user are lifted, and the contraction of the gluteal muscles and the like is supported.

[0043] The lower edge 334 is provided so as to surround the thigh of the user. The lower edge 334 is provided to be inclined in the direction of the waist holding part 2 from the thigh body part 13 to the lower abdomen telescopic part 32. Therefore, when moving the thigh forward during wearing, it becomes easy to move without interfering with the telescopic part 3.

[0044] Since the upper edge 335 is provided away from the front body part 11 to the waist holding part 2, a surface with low elasticity is generated therebetween. When the protruding part of the ilium is located on this surface during wearing, the discomfort of the user's pelvis being tightened can be reduced.

[0045] Hereinafter, with reference to FIGS. 5 and 6, the method of implementing the present invention (the process of posture improvement) will be described in detail. The present invention is implemented by a user who is in a standing position, walking posture, or sitting position while wearing the present invention. Also, the method of implementation shown below is an example, and the method of implementation is not limited to this, and the order may be reversed.

[0046] When the user is in a standing position, as shown in FIG. 5, the telescopic part 3 contracts. That is, it acts in the direction in which the spinal telescopic part 31 contracts, and the connecting telescopic part 33 connected thereto contracts, and a force is applied in the direction of pulling the lower abdominal telescopic part 32 laterally, pressing the abdominal side of the user. In this way, when the spinal telescopic part 31 actually contracts (pulls in the abdominal direction), tension is applied to the lower abdominal telescopic part 32 on the abdominal side, and the transverse abdominal muscle etc. is supported, suppressing excessive forward tilt of the pelvis and excessive forward curvature of the lumbar spine, thereby improving the posture. Even during walking, the telescopic part 3 expands and contracts in the same manner as above, suppressing excessive forward tilt of the pelvis and excessive forward curvature of the lumbar spine, thereby improving the posture. At this time, since the lower edge 334 does not interfere with the user's thigh, the user can walk easily.

[0047] When the user is in a sitting position, as shown in FIG. 6, since the user's buttocks become relatively larger compared to the standing position, the spinal telescopic part 31 contracts. At this time, since the undergarment X is held by the waist holding part 2, the spinal telescopic part 31 contracts toward the waist holding part 2, applying a force in the head direction along the spine of the body. Thereby, muscles such as the multifidus muscle can be supported to maintain the forward curvature of the lumbar spine and improve the posture. Also, similarly, the connecting telescopic part 33 also applies an upward force along the side of the buttocks, making it easier for the muscles of the buttocks to contract and improving the posture. As described above, it becomes possible to support the user's posture during walking, standing, and sitting.

[0048] In addition, since each of the elastic parts 3 is not configured to constrict the entire undergarment X but to connect predetermined parts to each other, the elastic parts 3 can exhibit their effects even if the body 1 is made with a margin. For this reason, the comfort of wearing the undergarment X can be improved.

[0049] Preferably, the spine elastic part 31 includes a branch band 312 that connects the middle of the elastic band 311 and the waist holding part, so that the spine can be supported more firmly in terms of expansion and contraction.

[0050] Preferably, the elastic part 3 has a lower abdomen elastic part 32 disposed in the front body 11 so as to cover the lower abdomen of the user, thereby supporting the transverse abdominal muscle and the like in a standing position and further improving the posture.

[0051] Preferably, the elastic part 3 has a connecting elastic part 33 that connects the front body 11 and the thigh body 13, so that in a standing position, the front body 11 or the lower abdomen elastic part 32 is pulled in the side direction, and the transverse abdominal muscle and the like can be supported more firmly.

[0052] Preferably, the connecting elastic part 33 branches in the middle and includes a branch connecting part 332 extending from the branch point toward the waist holding part 2, so that a pulling force can be applied to the connecting elastic part 33 from above and below, and the transverse abdominal muscle and the like can be supported more firmly.

[0053] Preferably, the waist holding part 2 is disposed so as to surround the upper end of the body 1 whose upper end is cylindrical, and includes a high-elasticity holding part 21 and a low-elasticity holding part 22 provided on the front body 11 and having lower elasticity than the high-elasticity holding part 21, so that while holding around the waist, constriction can be reduced.

[0054] The elastic part has a lower abdomen elastic part 32 disposed in the front body 11 so as to cover the lower abdomen of the user, and the low-elasticity holding part 22 is provided integrally with the lower abdomen elastic part 32, so that the number of parts can be reduced and the manufacturing cost can be suppressed.

Explanation of Reference Numerals

[0055] X Underwear 1 Body 11 Front body part 111 Folding part 12 Rear body part 121 Crotch side 122 Opening side 13 Crotch body part 131 Front crotch connection side 132 Rear crotch connection side 133 Gusset side 14 Body part connection side 2 Waist holding part 21 High - elasticity holding part 22 Low - elasticity holding part 3 Stretchable part 31 Spinal stretchable part 311 Elastic band 312 Branch band 313 Parallel sheet 314 Branch sheet 315 Crotch sheet 32 Lower abdomen stretchable part 321 Lower abdomen surface 322 Pocket part 33 Connecting stretchable part 331 Connecting stretchable part body 332 Branch connecting part 333 Hip edge 334 Lower edge 335 Upper edge

Claims

1. An undergarment comprising a stretchable body and a waist holding part for holding the body at the user's waist position, wherein the body has a front body, a rear body continuous with the front body, and a crotch body connecting the front body and the rear body at the user's crotch position, a stretching part for controlling the degree of stretch of the body is arranged at a predetermined position, the stretching part has a spinal stretching part connecting the crotch body and the waist holding part on the rear body, the spinal stretching part includes an elastic band that is arranged along the user's spine when worn and has higher elasticity than the rear body.

2. The undergarment according to claim 1, wherein the spinal stretching part includes a branch band connecting a middle part of the elastic band and the waist holding part.

3. The undergarment according to claim 1 or 2, wherein the stretching part has a lower abdomen stretching part arranged to cover the user's lower abdomen on the front body.

4. The undergarment according to claim 3, wherein the stretching part has a connecting stretching part connecting the front body and the crotch body.

5. The undergarment according to claim 4, wherein the connecting stretching part branches in the middle and includes a branch connecting part extending from the branch point toward the waist holding part.

6. the waist holding part is arranged to surround the upper end of the body whose upper end is cylindrical, The undergarment according to claim 1 or 2, comprising a high-elasticity holding part and a low-elasticity holding part provided on a part of the front body and having lower elasticity than the high-elasticity holding part.

7. the stretching part has a lower abdomen stretching part arranged to cover the user's lower abdomen on the front body, The undergarment according to claim 6, wherein the low-elasticity holding part is provided integrally with the lower abdomen stretching part.

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