Sheet

Abstract

To suppress a position of each part different in rigidity from shifting from a desired position by suppressing a planar substrate from shrinking in a direction where weft extends.SOLUTION: A seat comprises a planar substrate 30 as the planar substrate 30 arranged inside a frame-like seat frame and supporting a seated person, having a plurality of warp T1 extending in a first direction and a plurality of weft T2 extending in a second direction orthogonal to the first direction. The planar substrate 30 has a planar part 31 as the planar part 31 for supporting the seated person, having a first site 31A and a second site 31B which is different from the first site 31A at least in the number of warp T1, a thickness and a material, fitting parts 32, 33 as the fitting parts 32, 33 fitted to the seat frame, positioned in each edge in the first direction of the planar part 31, and a wrinkle suppression member 35 disposed in the planar part 31 and having rigidity higher than that of the planar part 31 and suppressing the planar part 31 from shrinking in the second direction and wrinkling.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a seat having a planar support body that supports a seated occupant. [Background technology]

[0002] 2. Description of the Related Art Conventionally, seats have been known that include a planar support that supports a seated person via a pad (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-104370 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, it is conceivable to configure the planar support with a woven fabric made of a plurality of warp threads extending in a first direction and a plurality of weft threads extending in a second direction perpendicular to the first direction. In this case, it is conceivable to reduce the burden on the seated person by varying the hardness of each part by setting the warp density, which is the number of warp threads per unit length in the second direction, to different densities for each part of the planar support. Specifically, for example, if it is desired to reduce the load applied from the planar support to the seat bones of the seated person, it is conceivable to make the part of the planar support that corresponds to the seat bones softer than the other parts.

[0005] However, in such a structure, if both ends of the planar support in the first direction are attached to a pair of frames, when the weight of the seated occupant is applied to the planar support, the planar support shrinks in the second direction and becomes wrinkled, causing the positions of each part with different hardness to shift from the desired position.

[0006] Therefore, an object of the present invention is to prevent the planar support from shrinking in the direction in which the weft thread extends, thereby preventing the positions of each portion with different hardness from shifting from the desired position. [Means for solving the problem]

[0007] In order to solve the above problems, the seat of the present invention comprises a frame-shaped seat frame and a planar support disposed inside the seat frame to support an occupant, the planar support having a plurality of warp threads extending in a first direction and a plurality of weft threads extending in a second direction perpendicular to the first direction. The planar support body has a planar portion that supports a seated occupant, the planar portion having a first portion and a second portion in which at least one of the number, thickness, and material of the warp threads is different from that of the first portion, a first mounting portion that is attached to the seat frame and is located at one end of the planar portion in the first direction, a second mounting portion that is attached to the seat frame and is located at the other end of the planar portion in the first direction, and a wrinkle suppression member that is provided on the planar portion and has higher rigidity than the planar portion to suppress the planar portion from shrinking in the second direction and causing wrinkles.

[0008] According to this configuration, a wrinkle suppression member having a higher rigidity than the planar portion is provided on the planar portion, thereby preventing the planar portion from shrinking in the second direction and causing wrinkles, thereby preventing the positions of the first and second portions, which have different rigidities, from shifting from the desired positions.

[0009] The wrinkle suppression member may extend in the second direction and restrain at least one end and the other end of the planar portion in the second direction.

[0010] According to this configuration, one end and the other end of the planar portion in the second direction are restrained by the wrinkle suppressing member, so that it is possible to suppress the planar portion from shrinking in the second direction and causing wrinkles.

[0011] The wrinkle suppression member may further include a first wrinkle suppression member located at one end of the planar portion in the first direction, and a second wrinkle suppression member located at the other end of the planar portion in the first direction.

[0012] According to this configuration, the two wrinkle suppression members can suppress one end and the other end of the planar portion in the first direction from shrinking in the second direction, thereby suppressing the entire planar portion from shrinking in the second direction and causing wrinkles.

[0013] Furthermore, each of the first wrinkle suppressing member and the second wrinkle suppressing member may be an elongated member.

[0014] In addition, the wrinkle suppression member may extend in the first direction, be provided at both ends of the planar portion in the second direction, restrain at least a portion of the planar portion, and be supported by the seat frame.

[0015] The seat frame may be a cushion frame.

[0016] The first direction may be a front-rear direction, and the second direction may be a left-right direction. Effect of the Invention

[0017] According to the present invention, it is possible to prevent the planar support from shrinking in the second direction in which the weft threads extend, and therefore it is possible to prevent the positions of the portions with different hardness from shifting from the desired positions.

[0018] Furthermore, by restraining at least one end and the other end of the planar portion in the second direction with a wrinkle suppressing member extending in the second direction, it is possible to suppress the planar portion from shrinking in the second direction and causing wrinkles.

[0019] In addition, by using two wrinkle suppression members to suppress shrinkage in the second direction of one end and the other end of the planar portion in the first direction, it is possible to suppress shrinkage of the entire planar portion in the second direction and the formation of wrinkles. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view showing a seat according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing a seat frame that constitutes a seat. [Diagram 3] 1A is a perspective view of the planar support as viewed obliquely from above and below the front, and FIG. [Figure 4] 1A is a side view of the planar support body, FIG. 1B is an enlarged cross-sectional view showing the structure around the first mounting portion, and FIG. 1C is an enlarged cross-sectional view showing the structure around the second mounting portion. [Diagram 5] 1A is a perspective view showing the relationship between the extension portion and a clip, etc., and FIG. 1B is an exploded perspective view showing the extension portion. [Figure 6] FIG. 2A is a plan view showing each portion of the planar portion, and FIGS. 2B to 2D are diagrams showing the difference in warp density in each portion. [Figure 7] 7A is a diagram showing a modified example of the extension portion and the mounting portion, FIG. 7B is an oblique view showing the extension portion of FIG. 7A, and FIG. 7C is an oblique view showing the state in which the hook portion of the extension portion is engaged with the hole. [Figure 8] FIG. 11 is a perspective view showing a first modified example of the wrinkle suppressing member. [Figure 9] FIG. 11 is a perspective view showing a second modified example of the wrinkle suppressing member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In this specification, the terms front, back, left, right, top, bottom, and so on refer to the front, back, left, right, top, and bottom as viewed from a person sitting in the seat. As shown in FIG. 1, the seat of this embodiment is configured as a vehicle seat S to be installed in an automobile, and includes a seat cushion S1, a seat back S2, and a headrest S3.

[0022] The seat cushion S1 is constructed by covering a cushion frame F1, which is an example of a seat frame, with a pad made of urethane foam or the like and a skin material made of fabric, leather, or the like, as shown in Fig. 2. The seat back S2 is constructed by covering a back frame F2, which is shown in Fig. 2, with a pad and a skin material. Although not shown, the head rest S3 is also constructed by covering a head rest frame with a pad and a skin material.

[0023] The cushion frame F1 is installed on the floor of the vehicle via slide rails SL, which allows the front-rear position of the vehicle seat S to be adjusted. The lower portion of the back frame F2 is rotatably connected to the rear part of the cushion frame F1 via a reclining mechanism RL.

[0024] The back frame F2 is mainly composed of an upper frame 21, left and right seatback side frames 22, and a lower frame 23, and is formed into a frame-like shape in which the upper frame 21, the left and right seatback side frames 22, and the lower frame 23 are joined together by welding or the like.

[0025] The upper frame 21 is made of a pipe material bent into a substantially U-shape, and a pair of left and right support brackets 21B for mounting a headrest S3 are fixed by welding to the front side of a horizontal pipe section 21A extending in the left-right direction. In addition, left and right vertical pipe sections 21C extending in the up-down direction of the upper frame 21 are integrated with left and right plate-shaped side frame main body sections 22A joined to their lower parts to form left and right seatback side frames 22.

[0026] The cushion frame F1 is mainly composed of left and right cushion side frames 11, a pan frame 12, and a rear connecting pipe 13, and is formed into a frame shape in which the left and right cushion side frames 11, the pan frame 12, and the rear connecting pipe 13 are integrally joined by welding, etc. A planar support body 30 that supports a seated occupant via a pad is disposed inside this frame-like cushion frame F1.

[0027] The pan frame 12 is a plate-like member extending in the front-rear and left-right directions. The pan frame 12 is disposed at a position farther from the reclining mechanism RL than the rear connecting pipe 13. The pan frame 12 has an attachment hook 12A at its rear end. The attachment hook 12A is a hook for attaching the front end of the planar support body 30. A plurality of attachment hooks 12A are provided at intervals in the left-right direction. The attachment hooks 12A are formed integrally with the pan frame 12 by cutting and raising a part of the plate-like pan frame 12.

[0028] The rear connecting pipe 13 is a cylindrical member extending in the left-right direction. The rear connecting pipe 13 has an attachment hook 13A for attaching the rear end of the planar support body 30. The attachment hook 13A is formed by bending a metal plate, and is joined to the rear connecting pipe 13 by welding or the like. A plurality of attachment hooks 13A are provided at intervals in the left-right direction.

[0029] 3(a) and (b), the planar support 30 has a sheet-like planar portion 31 that supports a seated occupant, a first attachment portion 32 and a second attachment portion 33 that are attached to the cushion frame F1, and an extension portion 34 that extends from the first attachment portion 32 and is located on the opposite side of the planar portion 31 from the seated occupant. The planar portion 31 is formed from a part of a single sheet-like member 30S. In this embodiment, the sheet-like member 30S is a cloth.

[0030] The first attachment portion 32 is disposed at the front end of the planar portion 31. The first attachment portion 32 has a wire 32A as an example of an engagement member, and a holding portion 32B that holds the wire 32A. The wire 32A is made of, for example, a metal, and has higher rigidity than the sheet-like member 30S.

[0031] The holding portion 32B is formed into a cylindrical shape by folding back a portion of the sheet-like member 30S and sewing it with thread ST. The wire 32A is inserted into the holding portion 32B and is held by the holding portion 32B. The holding portion 32B is formed with a notch 32C that exposes the wire 32A. A plurality of notches 32C are provided at intervals in the left-right direction. The portion of the wire 32A exposed from the notch 32C is engageable with the mounting hook 12A of the pan frame 12, as shown in FIG. 4(b).

[0032] As shown in Fig. 3(a), the second mounting portion 33 is disposed at the rear end of the planar portion 31. The second mounting portion 33 has a structure similar to that of the first mounting portion 32. Specifically, the second mounting portion 33 has a wire 33A and a cylindrical holding portion 33B having a plurality of notches 33C. As shown in Fig. 4(c), the portion of the wire 33A exposed from the notches 33C is engageable with a mounting hook 13A joined to the rear connecting pipe 13.

[0033] 4(b), the extension portion 34 is provided so as to hang down from the front first mounting portion 32. By providing the extension portion 34 on the front first mounting portion 32 in this manner, the distance from the extension portion 34 to the rear connecting pipe 13 is greater than the distance from the extension portion 34 to the pan frame 12.

[0034] The extension portion 34 has a cylindrical portion 34A and a reinforcing member 34B disposed within the cylindrical portion 34A. The cylindrical portion 34A is formed into a cylindrical shape by folding back the front end portion of the sheet-like member 30S and sewing it with thread ST. In detail, the front end portion of the sheet-like member 30S is sandwiched between the ends of a C-shaped portion in cross section of the sheet-like member 30S that forms the holding portion 32B, and is sewn together with the ends with thread ST to form the cylindrical portion 34A and the holding portion 32B.

[0035] The reinforcing member 34B is a member having higher rigidity than the sheet-like member 30S, and is made of, for example, a resin plate. As shown in Fig. 5(b), the reinforcing member 34B is a plate-like member and has locking holes H1 as locking portions. The locking holes H1 are through holes that penetrate the reinforcing member 34B, and two of them are provided with a gap between them in the left-right direction.

[0036] The cylindrical portion 34A has an exposure hole H2 that exposes the locking hole H1 to the outside. The exposure hole H2 has a first exposure hole H21 that exposes one opening of the locking hole H1 to the outside, and a second exposure hole H22 that exposes the other opening of the locking hole H1 to the outside. As shown in FIG. 5(a), the reinforcing member 34B is fixed to the cylindrical portion 34A by sewing with thread ST. A wire harness WH that transmits power or signals to an electrical component is engaged with the locking hole H1 of the reinforcing member 34B by a clip CP (see also FIG. 4(b)).

[0037] 6(a) to 6(d), the sheet-like member 30S has a plurality of warp threads T1 extending in a front-rear direction as a first direction, and a plurality of weft threads T2 extending in a left-right direction as a second direction perpendicular to the first direction. The warp threads T1 are thicker than the weft threads T2 and are configured to be easily elastically deformed. Specifically, for example, the warp threads T1 are made of elastomer, and the weft threads T2 are made of polyester.

[0038] The planar portion 31 has a first portion 31A, a second portion 31B, a third portion 31C, and a fourth portion 31D, which have different warp densities, which are the number of warp threads T1 per unit length UL in the left-right direction. The first portion 31A is located at both left and right ends of the planar portion 31. As shown in FIG. 6(b), the first portion 31A has a first density, which is the highest warp density. The pitch of the multiple warp threads T1 that make up the first portion 31A is approximately constant.

[0039] The second portion 31B is provided at a position corresponding to each of the left and right ischia of a seated person. As shown in Fig. 6(c), the second portion 31B has a second warp density lower than the first density. The pitch of the multiple warp threads T1 constituting the second portion 31B is substantially constant.

[0040] The third region 31C is provided between the left first region 31A and the left second region 31B, and between the right first region 31A and the right second region 31B. The warp density of the third region 31C is lower than the first density and higher than the second density. The pitch of the multiple warp threads T1 constituting the third region 31C gradually increases from the first region 31A to the second region 31B.

[0041] The fourth region 31D is provided between the left and right second regions 31B. The fourth region 31D has a warp density lower than the first density and higher than the second density. The pitch of the multiple warp threads T1 constituting the fourth region 31D gradually increases from the left and right ends toward the center, for example.

[0042] 3(a) and (b), wrinkle suppressing member 35 is provided on planar portion 31 to suppress wrinkles caused by shrinkage of planar portion 31 in the left-right direction. Wrinkle suppressing member 35 includes first wrinkle suppressing member 35A located at the front end of planar portion 31 and second wrinkle suppressing member 35B located at the rear end of planar portion 31. First wrinkle suppressing member 35A and second wrinkle suppressing member 35B are each a member having higher rigidity than planar portion 31, and are made of, for example, a resin plate.

[0043] First wrinkle suppression member 35A and second wrinkle suppression member 35B are each long plate-like members extending from one end to the other end in the left-right direction of planar portion 31, and are fixed by being entirely sewn to planar portion 31 with thread ST. In this way, first wrinkle suppression member 35A and second wrinkle suppression member 35B restrain the entire planar portion 31 so as to prevent planar portion 31 from shrinking in the second direction. Note that, in order to prevent planar portion 31 from shrinking in the second direction, only the left-right ends of first wrinkle suppression member 35A and second wrinkle suppression member 35B may be sewn to planar portion 31 to restrain one end and the other end in the left-right direction of planar portion 31. Furthermore, when providing the wrinkle suppression member on the planar support, in this embodiment the wrinkle suppression member is sewn to the planar support, but the wrinkle suppression member may also be integrally molded on the planar support by injection molding by impregnating the planar support with resin.

[0044] As described above, the following effects can be obtained in this embodiment. Since the extension portion 34 to which the wire harness WH is engaged is located on the opposite side of the seated occupant with respect to the planar portion 31, it is possible to prevent the seated occupant from feeling the presence of the wire harness WH and the clip CP engaged with the extension portion 34. Therefore, the wire harness WH can be attached to the planar support body 30 without causing the seated occupant to feel uncomfortable.

[0045] Since the extension portion 34 is positioned at a position far away from the reclining mechanism RL, it is possible to prevent members provided on the back frame F2 from interfering with the extension portion 34 when the back frame F2 is rotated relative to the cushion frame F1.

[0046] Since the extension portion 34 is formed by folding back an end portion of the sheet-like member 30S that constitutes the planar portion 31, the extension portion 34 can be easily formed.

[0047] Since the extension 34 has the reinforcing member 34B having higher rigidity than the sheet-like member 30S, the strength of the portion to which the wire harness WH is attached can be increased.

[0048] Since the cylindrical portion 34A has the exposure hole H2 that exposes the locking hole H1 of the reinforcing member 34B to the outside, the clip CP can be satisfactorily engaged with the locking hole H1 of the reinforcing member 34B.

[0049] Since the extension portion 34 extends from the first mounting portion 32, the load applied to the extension portion 34 from the wire harness WH is less likely to be transmitted to the planar portion 31, so that the planar portion 31 can provide good support for the seated occupant.

[0050] Since the mounting portions 32, 33 have the wires 32A, 33A that engage with the mounting hooks 12A, 13A, the mounting portions 32, 33 can be attached to the cushion frame F1 in a good condition.

[0051] By providing the wrinkle suppression member 35, which has a higher rigidity than the planar portion 31, on the planar portion 31, shrinkage of the planar portion 31 in the second direction and the formation of wrinkles are suppressed, and therefore the positions of each portion with a different warp density, particularly the second portion 31B supporting the ischial bones of a seated person, can be suppressed from shifting from the desired position.

[0052] The wrinkle suppression member may extend in the second direction and restrain at least one end and the other end of the planar portion in the second direction.

[0053] Since the wrinkle suppression members 35 extending in the left-right direction restrict the planar portion 31 from shrinking in the left-right direction, it is possible to suppress the planar portion 31 from shrinking in the left-right direction and causing wrinkles.

[0054] The two wrinkle suppression members 35A, 35B can suppress the front and rear ends of the planar portion 31 from shrinking in the left-right direction, thereby suppressing the entire planar portion 31 from shrinking in the left-right direction and causing wrinkles.

[0055] The present invention is not limited to the above-described embodiment, but can be used in various forms as exemplified below. In the following description, the same reference numerals are used to designate components having substantially the same structures as those in the above-described embodiment, and the description thereof will be omitted.

[0056] In the above embodiment, the extension portion 34 is configured to extend from the first attachment portion 32, but the present invention is not limited to this, and for example, as shown in Fig. 7(a), the extension portion 36 may extend from the planar portion 31. Specifically, in this embodiment, the extension portion 36 is made of a plate-shaped resin member and is fixed to the planar portion 31 by sewing with thread ST. Note that, when providing the extension portion on the planar support, although the extension portion is sewn to the planar support in this embodiment, the extension portion may alternatively be integrally molded with the planar support by injection molding in which the planar support is impregnated with resin.

[0057] 7(b) and (c), the extending portion 36 has a locking portion 361 for directly locking the wire harness WH. The locking portion 361 has a hole H3 formed in the extending portion 36, a strip-shaped portion 361A extending from a part of the contour of the extending portion 36, and a hook portion 361B provided at the tip of the strip-shaped portion 361A and engaging with the hole H3.

[0058] According to this embodiment, when the hook portion 361B at the tip of the band-shaped portion 361A is engaged with the hole H3, the band-shaped portion 361A becomes cylindrical, so that the wire harness WH can be held by the cylindrical band-shaped portion 361A. Therefore, in this embodiment, the clip CP as in the above embodiment is not required.

[0059] The structure of the mounting portion is not limited to the above embodiment. For example, as shown in FIG. 7(a), the first mounting portion 37 located at the front end of the planar portion 31 may be a hook-shaped resin member that engages with the mounting hook 12A of the pan frame 12. The second mounting portion 38 located at the rear end of the planar portion 31 may be composed of two hooks 38A, 38B and a connecting portion 38C that connects the two hooks 38A, 38B. The connecting portion 38C is a part of the sheet-like member 30S, and the hooks 38A, 38B are fixed to each end in the front-rear direction. The second mounting portion 38 is attached to the rear connecting pipe 13 by engaging the hooks 38A, 38B with the connecting portion 38C wrapped around the rear connecting pipe 13.

[0060] The extension and the attachment may have various other structures. For example, the extension may have a structure in which the reinforcing member 34B is removed from the structure in Fig. 5(b). In this case, an attachment member for attaching a wire harness WH or the like may be engaged with the exposure hole H2 formed in the cylindrical portion 34A of the extension 34. The attachment may also be a hole formed in the sheet-like member that engages with an attachment hook.

[0061] In the above embodiment, the predetermined member that is engaged with the extension portion is the wire harness WH. However, the predetermined member may be, for example, an operating wire for operating a reclining mechanism or the like.

[0062] 8, first wrinkle suppressing member 135A and second wrinkle suppressing member 135B may each be a bar-shaped member, for example a metal rod. In this case, left and right ends of planar portion 31 may be provided with folded-back portions 311 that are folded back onto the underside of planar portion 31, and first wrinkle suppressing member 135A may restrict inward movement of left and right folded-back portions 311 in the left-right direction. Specifically, a bag-shaped portion may be formed by sewing front and rear ends of left and right folded-back portions 311 to planar portion 31, and both ends of first wrinkle suppressing member 135A may be inserted into this bag-shaped portion.

[0063] Furthermore, a sheet-like holding member 312 for holding first wrinkle suppressing member 135A may be provided in the center in the left-right direction of planar portion 31. Specifically, a cylindrical portion is formed by sewing front and rear ends of sheet-like holding member 312 to planar portion 31, and first wrinkle suppressing member 135A is placed inside this cylindrical portion.

[0064] 9, the wrinkle suppressing member 235 may have a first rod-shaped portion 235A and a second rod-shaped portion 235B extending in the front-rear direction and disposed at both ends of the planar portion 31 in the left-right direction. Specifically, the first rod-shaped portion 235A is integrally formed with one end of the wire 32A in the left-right direction, and the second rod-shaped portion 235B is integrally formed with the other end of the wire 32A in the left-right direction. The front ends of the first rod-shaped portion 235A and the second rod-shaped portion 235B are supported by the pan frame 12 via the wire 32A. The rear ends of the first rod-shaped portion 235A and the second rod-shaped portion 235B are supported by a locking piece 13B joined to the rear connecting pipe 13.

[0065] The left and right ends of the sheet-like portion 31 are provided with the folded portions 311 as described above. The left and right folded portions 311 are sewn to the sheet-like portion 31 while being wrapped around the first rod-shaped portion 235A or the second rod-shaped portion 235B. In this embodiment, the left and right folded portions 311 are disposed on the front side of the sheet-like portion 31. Therefore, the wrinkle suppressing member 235 restrains the front portion of the sheet-like portion 31. When the folded portions 311 are formed from the front end to the rear end of the sheet-like portion 31, the wrinkle suppressing member 235 restrains the entire sheet-like portion 31.

[0066] In the above embodiment, the seat is exemplified as a vehicle seat S used in an automobile, but the present invention is not limited to this, and may be a seat for other vehicles, for example, a seat used in a ship, an airplane, etc. Furthermore, the seat is not limited to a vehicle seat, and may be, for example, a seat chair, furniture, an outdoor chair, etc.

[0067] In the above embodiment, a cushion frame is exemplified as the seat frame, but the present invention is not limited thereto, and the seat frame may be a back frame. In this case, the first direction may be the up-down direction, and the second direction may be the left-right direction. Note that the first direction may be the left-right direction, and the second direction may be the front-rear direction or the up-down direction.

[0068] In the above embodiment, the number of warp threads is different in each part of the planar portion, but the present invention is not limited to this, and each part of the planar portion may have different hardness, for example, the thickness of the warp threads in each part of the planar portion may be different, or the material of the warp threads in each part of the planar portion may be different. In other words, the planar portion may have a first part and a second part in which at least one of the number, thickness, and material of the warp threads is different from that in the first part.

[0069] The elements described in the above-mentioned embodiment and modified examples may be implemented in any combination. [Explanation of symbols]

[0070] 30 Planar support 31 Planar part 31A Part 1 31B 2nd part 32 First mounting part 33 Second mounting part 35 Wrinkle prevention material F1 Cushion Frame T1 Warp T2 Weft

Claims

1. A frame-shaped seat frame; A seat comprising: a planar support disposed inside the seat frame to support a seated occupant, the planar support having a plurality of warp threads extending in a first direction and a plurality of weft threads extending in a second direction perpendicular to the first direction; The planar support is a planar portion for supporting a seated occupant, the planar portion having a first portion and a second portion in which at least one of the number, thickness and material of the warp threads is different from that of the first portion; a first attachment portion attached to the seat frame, the first attachment portion being located at one end of the planar portion in the first direction; a second attachment portion attached to the seat frame, the second attachment portion being located at the other end of the planar portion in the first direction; a wrinkle suppressing member that is provided at a position away from the first attachment portion and the second attachment portion of the planar portion, the wrinkle suppressing member having a higher rigidity than the planar portion and suppressing the planar portion from shrinking in the second direction and causing wrinkles, The wrinkle suppression member extends from one end to the other end of the planar portion in the second direction and restrains at least the one end and the other end of the planar portion in the second direction.

2. The wrinkle suppressing member is a first wrinkle suppressing member located at one end of the planar portion in the first direction; The sheet according to claim 1 , further comprising: a second wrinkle suppressing member located at the other end of the planar portion in the first direction.

3. 3. The sheet according to claim 2, wherein the first wrinkle suppressing member and the second wrinkle suppressing member are each formed of an elongated member.

4. The wrinkle suppression member is made of a resin plate, The sheet according to claim 1 , wherein each end of the wrinkle suppression member in the second direction is sewn to the planar portion.

5. A bag-shaped portion is formed at each end of the planar portion in the second direction, One end of the wrinkle suppressing member is inserted into the bag-shaped portion on one side in the second direction, 2. The sheet according to claim 1, wherein the other end of the wrinkle suppression member is inserted into the bag-shaped portion on the other side in the second direction.

6. 6. The seat according to claim 1, wherein the seat frame is a cushion frame.

7. The first direction is a front-rear direction, The seat according to claim 6, wherein the second direction is a left-right direction.

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