Cushions and posture support

Abstract

To provide a cushion capable of correcting posture and a posture holder attachable to the cushion. [Solution] The cushion 1 comprises a first elastic portion 3 for pressing the sacrum, a pair of second elastic portions 4 arranged on both the left and right sides of the first elastic portion 3 for pressing the hip joints, a pair of third elastic portions 5 arranged respectively above the pair of second elastic portions for pressing the upper part of the ilium, and a cushion main body portion 2 for fixing the first to third elastic portions 3 to 5, and the second elastic portion 4 has a shape that is long in the vertical direction.

Description

[Technical Field]

[0001] The present invention relates to a cushion and a posture support device. [Background technology]

[0002] The cushion is a Western-style floor cushion, and is mainly used by placing it on the back of a chair or sofa. However, because cushions are generally made of soft materials, depending on the size, shape, and placement of the cushion, or the way and angle of leaning on the cushion, it is easy to develop a hunched posture, such as a hunched back, which can put a lot of strain on the lower back. Therefore, as a cushion that properly maintains posture while suppressing pelvic misalignment, for example, Patent Document 1 proposes a cushion with a protruding surface that supports the sacrum. However, the cushion in Patent Document 1 only corrects pelvic misalignment in one place (the protruding surface), and is therefore insufficient as a corrective device.

[0003] On the other hand, as posture correction devices, Patent Document 2 proposes a lower back supporter having first to third pads for pressing on the sacrum and the left and right ilium, and Patent Document 3 proposes a posture supporter having a protrusion that abuts against the posterior part of the sacrum. However, these are supports or posture supporters whose sole purpose is to correct posture, and they do not have the elasticity or softness of a cushion, and do not function as a cushion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2023-55605 [Patent Document 2] Utility Model Registration No. 3114538 [Patent Document 3] Patent Publication No. 2020-54922 Summary of the Invention [Problem to be solved by the invention]

[0005] To provide a cushion capable of correcting posture and a posture support device that can be attached to the cushion. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides the following inventions.

[0007] The present invention [1] comprises a first elastic part for pressing the sacrum, a pair of second elastic parts arranged on both the left and right sides of the first elastic part for pressing the hip joints, a pair of third elastic parts arranged respectively above the pair of second elastic parts for pressing the upper part of the ilium, and a cushion main body part for fixing the first elastic part, the second elastic part and the third elastic part, wherein the second elastic part includes a cushion having a shape that is long in the vertical direction.

[0008] According to this invention, since the cushion main body part that fixes the first elastic part, the second elastic part, and the third elastic part is provided, it has cushioning properties, that is, it is soft and has the property of being able to absorb shock by deforming in response to shock and returning to its original shape. The first elastic part for pressing the sacrum, the second elastic part for pressing the hip joint, and the third elastic part for pressing the upper ilium are provided, so it is possible to press the sacrum, hip joint, and upper ilium. Furthermore, since the second elastic part for pressing the hip joint has a shape that is long in the vertical direction, by aligning it with the hip joint (i.e., the depression between the femur and ischium), the first to third elastic parts can accurately press the sacrum, hip joint, and upper ilium. Therefore, it is possible to correct posture while maintaining cushioning properties.

[0009] The present invention [2] includes the cushion according to [1], wherein the first elastic portion has a shape that is long in the vertical direction, and the third elastic portion has a shape that is long in the horizontal direction.

[0010] According to this invention, the first elastic portion can press against the sacrum, and the third elastic portion can press against the upper ilium more reliably. In particular, even if the cushion is displaced vertically when placed against the lower back, the first elastic portion can reliably press against the sacrum.

[0011] The present invention [3] includes the cushion described in [1] or [2], in which the lower portion of the second elastic portion is formed so as to protrude in the opposite direction from the cushion main body side more than the upper portion of the second elastic portion.

[0012] According to this invention, the lower part of the second elastic part protrudes, so that the hip joint can be supported from below, and the first to third elastic parts can stably press against the sacrum, hip joint, and upper ilium, thereby enabling stable posture correction even when used for long periods of time.

[0013] The present invention [4] includes the cushion described in any one of [1] to [3], further comprising a pair of fourth elastic parts between the first elastic part and the pair of second elastic parts for pressing against the ischial tuberosities.

[0014] According to this invention, the fourth elastic portion presses against the ischial bones, so that the pelvis can be supported more stably.

[0015] The present invention [5] includes the cushion described in [4], in which the lower part of the fourth elastic part is formed so as to protrude in the opposite direction from the cushion side more than the upper part of the fourth elastic part.

[0016] According to this invention, the protruding lower portion of the fourth elastic part can support the pelvis from below, and the first to fourth elastic parts can stably press against the sacrum, hip joints, upper ilium, and ischium, thereby enabling stable posture correction even when used for long periods of time.

[0017] The present invention [6] includes a posture support device comprising a first elastic part for pressing the sacrum, a pair of second elastic parts arranged on both the left and right sides of the first elastic part for pressing the hip joints, a pair of third elastic parts arranged on the upper side of the pair of second elastic parts for pressing the upper part of the ilium, and a flexible flat plate member for fixing the first elastic part, the second elastic part and the third elastic part, wherein the second elastic part has a shape that is long in the vertical direction.

[0018] According to this invention, by placing the cushion, the cushion can be given the function of correcting posture.

[0019] The present invention [7] includes the posture support device described in [6], further comprising a pair of fourth elastic parts for pressing the ischial tuberosities between the first elastic part and the pair of second elastic parts.

[0020] According to this invention, the fourth elastic portion presses against the ischial bones, so that the pelvis can be supported more stably. [Effects of the Invention]

[0021] The cushion of the present invention can correct posture while retaining cushioning properties. Furthermore, by attaching the posture support device of the present invention to the cushion, the cushion can be endowed with a posture correction function. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 shows a cushion according to a first embodiment of the present invention, with the left drawing showing a front view and the right drawing showing a right side view. [Figure 2] FIG. 2 shows a perspective view of the cushion of FIG. [Figure 3] FIG. 3 shows the cushion of FIG. 1 in use. [Figure 4] FIG. 4 shows a diagram comparing the positions of the first to third elastic parts with the vicinity of the pelvis when the cushion of FIG. 1 is placed against the lower back. [Figure 5]FIG. 5 shows the posture maintaining device of the first embodiment of the present invention, with the left figure showing a front view and the right figure showing a right side view. [Figure 6] FIG. 6 shows a front view of a cushion according to a second embodiment of the present invention. [Figure 7] FIG. 7 shows a cushion according to a third embodiment of the present invention, with the left figure showing a front view and the right figure showing a right side view. [Figure 8] FIG. 8 shows a perspective view of the cushion of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0023] First Embodiment 1. Cushion A cushion 1 according to a first embodiment will be described as an example of a cushion of the present invention using Figures 1 to 4. In terms of directions, the up-down direction (first direction), the left-right direction (second direction), and the front-rear direction (third direction) are perpendicular to each other.

[0024] The cushion 1 includes a cushion main body 2, a first elastic portion 3, a pair of second elastic portions 4, and a pair of third elastic portions 5.

[0025] The cushion main body 2 has cushioning properties. That is, it is soft and has the property of absorbing impact by deforming in response to the impact and returning to its original shape. The cushion main body 2 has a predetermined thickness (length in the front-rear direction). Examples of the cushion main body 2 include a cushion made of an elastic material (e.g., high-resilience urethane, low-resilience urethane, rubber material) that is softer than the first to third elastic parts 3 to 5; a cushion with a bag cover filled with a filling material (e.g., polyester cotton, small feathers, microbeads, microfiber), etc.

[0026] The size of the cushion main body 2 is not limited, but from the viewpoint of being able to arrange the first to third elastic parts 4 and being able to apply a sufficient repulsive force to the human body, the left-right length and the up-down length are each, for example, 200 mm to 1000 mm. It is preferable that the front-rear length (thickness) Tc of the cushion main body 2 at the location where the first to third elastic parts 3 to 5 described below are arranged is at least 50 mm.

[0027] The first elastic portion 3 is a member for pressing or supporting the sacrum. The first elastic portion 3 is an elastic member having a rectangular parallelepiped shape that is long in the vertical direction, and is disposed on the front surface of the cushion main body 2 near the center in the horizontal direction. The first elastic portion 3 is formed from an elastic material such as polyurethane (including polyurethane foam) or rubber (e.g., natural rubber, chloroprene rubber, nitrile rubber, acrylic rubber, SBR, or silicone rubber). Preferably, it is formed from polyurethane. The vertical length L1 of the first elastic portion 3 is, for example, 40 mm or more and 100 mm or less, from the viewpoint of reliably pressing the sacrum. The horizontal length W1 is, for example, 10 mm or more and 40 mm or less. The ratio (L1 / W1) of the vertical length L1 to the horizontal length W1 is, for example, 3 times or more and 10 times or less. The front-rear length of the first elastic portion 3, i.e., the protruding direction length T1, is, for example, 10 mm or more and 40 mm or less. The upper end of the first elastic portion 3 is located above the upper end of the second elastic portion 4 and below the lower end of the third elastic portion 5.

[0028] The pair of second elastic portions 4 are members for pressing or supporting the hip joints. The pair of second elastic portions 4 are elastic members having a rectangular parallelepiped shape that is long in the vertical direction. They are arranged on the front surface of the cushion body 2, one on the left side and one on the right side of the first elastic portion 3, with a gap between them. That is, the first elastic portion 3 is arranged in the horizontal center of the pair of second elastic portions 4 that are arranged with a gap between them in the horizontal direction. The second elastic portions 4 are made of the same material as the first elastic portions 3. The pair of second elastic portions 4 are line-symmetrical with respect to a line that passes vertically through the horizontal center of the first elastic portions 3. The vertical length L2 of the second elastic portions 4 is, for example, 40 mm or more and 150 mm or less, from the viewpoint of reliably pressing the vicinity of the hip joints. The horizontal length W2 is, for example, 10 mm or more and 40 mm or less. The ratio (L2 / W2) of the vertical length L2 to the horizontal length W2 is, for example, 3 to 10 times. The front-rear length (length in the protruding direction) T2 of the second elastic portion 4 is substantially the same as that of the first elastic portion 3, and is, for example, 0.8 to 1.2 times the front-rear length of the first elastic portion 3. The distance (gap) S1 in the left-right direction between the pair of second elastic portions 4 is 100 mm to 200 mm. The upper end of the second elastic portion 3 is located lower than the upper end of the first elastic portion 3, and the difference in the up-down direction therebetween is, for example, 5 mm to 30 mm.

[0029] The pair of third elastic portions 5 are members for pressing or supporting the upper ilium. Each third elastic portion 5 is an elastic member having a rectangular parallelepiped shape elongated in the left-right direction. Each third elastic portion 5 is disposed on the front surface of the cushion body 2, one above the pair of second elastic portions 4 and spaced apart from the second elastic portions 4. The first elastic portions 3 do not overlap the line connecting the pair of third elastic portions 5 in the left-right direction, but are located below the line. The third elastic portions 5 are formed from the same material as the first elastic portions 3. The pair of third elastic portions 5 are symmetrical with respect to a line passing vertically through the center of the first elastic portions 3 in the left-right direction. The left-right length W3 of the third elastic portion 5 is, for example, 40 mm to 100 mm, in order to reliably press the area near the upper ilium. The up-down length L3 is, for example, 10 mm to 40 mm. The ratio (W3 / L3) of the left-right length W3 to the up-down length L3 is, for example, 3 to 10 times. The front-to-back length (projecting length) T3 of the third elastic portion 5 is substantially the same as that of the first elastic portion 3 and is, for example, 0.8 to 1.2 times the front-to-back length of the first elastic portion 3. The vertical spacing S2 between the second elastic portion 4 and the third elastic portion 5 is, for example, 10 mm to 30 mm, taking into account the positional relationship between the hip joint and the upper ilium. The left-to-right spacing S3 between the pair of third elastic portions 5 is, for example, 2 to 5 times the left-to-right length of the first elastic portion 3, from the viewpoint of ensuring that the first elastic portion 3 and the third elastic portion 5 can independently and reliably press against the sacrum and the upper ilium, respectively.

[0030] The cushion 1 can be produced by preparing a commercially available or publicly known cushion (corresponding to the cushion main body 2) and five rectangular parallelepiped elastic members (corresponding to the first to third elastic portions 3 to 5), and then using an adhesive or the like to fix the five rectangular parallelepiped elastic members to the cushion in the arrangement shown in Fig. 1. The cushion can also be produced by placing a posture-maintaining device 6, which will be described later, on the surface of the cushion, or by embedding the first to third elastic portions 3 to 5 inside the cushion so that they are exposed and protrude from the cushion surface.

[0031] The cushion 1 described above can correct posture while functioning as a cushion. That is, as shown in FIG. 3, when sitting on a chair, the cushion's cushioning properties protect the spine and lower back from the hardness of the chair while correcting posture. In particular, the first to third elastic portions 3 to 5 protrude from the surface of the cushion body 2 and have approximately the same length in the protruding direction, allowing them to simultaneously press against the sacrum, hip joints, and upper ilium. Furthermore, the protruding second elastic portion 4 easily and securely fits into the hip joint (i.e., between the femur and ischium), allowing the first to third elastic portions 3 to 5 to accurately press against the sacrum, hip joints, and upper ilium, respectively (see FIG. 4). Therefore, when sitting on a chair using the cushion 1, a force acts to keep the pelvis, including the sacrum and ilium, vertical, thereby correcting posture.

[0032] 2. Posture support device The posture maintaining device 6 according to the first embodiment of the present invention will be described with reference to FIG.

[0033] The posture maintaining device 6 is attached to a cushion for use and comprises a flexible flat plate member 7, a first elastic part 3, a pair of second elastic parts 4, a pair of third elastic parts 5, and multiple pairs of mounting members 8.

[0034] The flexible flat plate member 7 is a flat plate that is generally rectangular in plan view. The flexible flat plate member 7 is flexible in the front-rear direction (i.e., the thickness direction of the plate), but not in the up-down or left-right directions. This allows the posture maintainer 6 to contact and be fixed to the cushion in accordance with the roundness or curve of the cushion, while maintaining the positional relationship of the first to third elastic parts 3 to 5 in the up-down and left-right directions. The flexible flat plate member 7 is formed from an elastic material such as polyurethane or rubber; or a non-elastic material such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, or polyethylene terephthalate. The length (thickness) of the flexible flat plate member 7 in the front-rear direction is, for example, 0.01 mm or more and 2 mm or less. The vertical and left-right lengths of the flexible flat plate member 7 may be any length that allows the first to third elastic parts to be appropriately arranged, and are, for example, 200 mm or more and 500 mm or less, respectively. A plurality of openings 9 for fixing the mounting members 8 are formed at each of the upper and lower ends of the flexible flat plate member 7.

[0035] The first elastic portion 3, the pair of second elastic portions 4, and the pair of third elastic portions 5 are the same as those described above in the cushion 1, and their arrangement on the flexible flat plate member 7 is also the same as their arrangement on the cushion main body portion 2 in the cushion 1.

[0036] Multiple pairs (two pairs) of mounting members 8 are arranged and fixed in the opening 9. Each pair of mounting members 8 is composed of a stretchable first belt-shaped member 11 having a detachable portion 10 at its tip, and a stretchable second belt-shaped member 13 having a detachable portion 12 at its tip. The detachable portion 10 is detachable from the detachable portion 12, and the detachable portion 10 and the detachable portion 12 are, for example, a pair of hook-and-loop tapes composed of a male and a female type.

[0037] This posture-maintaining device 6 can be attached to a known or commercially available cushion and used to provide the cushion with the same effects as the cushion 1 of the first embodiment. That is, it can correct posture while maintaining the function of a cushion. When attaching, it may be attached to the surface of the cushion, or it may be attached inside the cushion so that the first to third elastic parts 3 to 5 are exposed and the flexible flat plate member 7 is buried.

[0038] As a modified example, when the flexible flat plate member 7 is made of an elastic body such as polyurethane or rubber and is made of the same material as the first to third elastic parts 3 to 5, the flexible flat plate member 7 and the first to third elastic parts 3 to 5 may be integrally molded. Also, the mounting member 8 may not be provided and the opening 9 may not be formed.

[0039] Second Embodiment A cushion 20 according to a second embodiment of the present invention will be described with reference to Fig. 6. Note that the same members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

[0040] The cushion 20 includes a cushion main body 2, a first elastic portion 3, a pair of second elastic portions 4, a pair of third elastic portions 5, and a pair of fourth elastic portions .

[0041] The pair of fourth elastic portions 21 are members for pressing or supporting the ischial bones. The pair of fourth elastic portions 21 are elastic members having a rectangular parallelepiped shape that is long in the vertical direction. Each fourth elastic portion 21 is disposed on the front surface of the cushion body 2 between the first elastic portion 3 and the pair of second elastic portions 4, with a gap therebetween. The fourth elastic portions 21 are formed from the same material as the first elastic portion 3. The pair of fourth elastic portions 21 are symmetrical with respect to a line that passes through the center of the first elastic portion 3 in the horizontal direction. The vertical length of the fourth elastic portion 21 is, for example, 30 mm to 100 mm, from the viewpoint of reliably pressing the ischial bones. The horizontal and front-to-rear lengths are substantially the same as those of the second elastic portion 4. The upper end of the fourth elastic portion 21 is located lower than the upper end of the second elastic portion 4, and the vertical difference therebetween is, for example, 5 mm to 15 mm.

[0042] The cushion 20 of the second embodiment also achieves the same effects as the cushion 1 of the first embodiment. The cushion 20 of the second embodiment is preferable. According to the second embodiment, the fourth elastic portion 21 presses against the ischial bone, and the first to third elastic portions 3 to 5 can accurately press against the sacrum, hip joints, and upper ilium, respectively, and as a result, posture can be corrected more reliably.

[0043] <Third embodiment> A cushion 30 according to a third embodiment of the present invention will be described with reference to Figures 7 and 8. Note that the same members as those in the first and second embodiments are denoted by the same reference numerals.

[0044] The cushion 30 includes a cushion main body 2, a first elastic portion 3, a pair of second elastic portions 4, a pair of third elastic portions 5, and a pair of fourth elastic portions 21.

[0045] The first elastic part 3 has a rectangular parallelepiped shape that is long in the vertical direction. The first elastic part 3 is formed so that the upper and lower ends are curved (specifically, formed in a semicircular shape) when viewed from the front, and the front end is curved when viewed from above.

[0046] The second elastic portion 4 has a rectangular parallelepiped shape that is long in the vertical direction. The second elastic portion 4 is formed so that its upper end is curved in a front view and its front end is curved in a plan view. The lower end surface of the second elastic portion 4 is formed so as to be flush with the lower end surface of the cushion main body 2. The lower portion 4B of the second elastic portion 4 is formed so as to protrude further forward than the upper portion 4A. The front-to-rear length of the upper portion 4A is approximately the same as the front-to-rear lengths of the first elastic portion 3 and the third elastic portion 4, and the front-to-rear length of the lower portion 4B is, for example, 1.5 to 3 times that of the upper portion 4A.

[0047] The third elastic portion 5 has a rectangular shape that is long in the left-right direction. The third elastic portion 5 is formed so that the left and right ends are curved in a front view, and the front end is curved in a plan view.

[0048] The fourth elastic portion 21 has a rectangular parallelepiped shape that is long in the vertical direction. The fourth elastic portion 21 is formed so that its upper end is curved in a front view and its front end is curved in a plan view. The lower end surface of the fourth elastic portion 21 is formed so as to be flush with the lower end surface of the cushion main body 2. The lower portion 21B of the fourth elastic portion 21 is formed so as to protrude further forward than the upper portion 21A. The front-to-rear length of the upper portion 21A is approximately the same as the front-to-rear length of the upper portion of the second elastic portion 4A, and the front-to-rear length of the lower portion 21B is approximately the same as the front-to-rear length of the lower portion of the second elastic portion 4B.

[0049] The cushion 20 of the third embodiment also achieves the same effects as the cushion 1 of the first embodiment. Preferably, it is the cushion 30 of the third embodiment. According to the third embodiment, the lower portions 4B, 21B of the second elastic portion 4 and the fourth elastic portion 21 protrude, so that the pelvis can be supported from below, and the first to fourth elastic portions can stably press against the sacrum, hip joints, upper ilium, and ischium. Therefore, posture can be stably corrected even when used for a long period of time.

[0050] Example 1 Five commercially available rectangular parallelepipeds (70 mm x 20 mm x 20 mm) of polyurethane elastomer were prepared and used as a first elastic portion, a pair of second elastic portions, and a pair of third elastic portions, respectively. The chloroprene rectangular parallelepipeds were placed on a commercially available cushion as shown in Figures 1 and 2 and fixed with adhesive. The spacing S1 between the second elastic portions 4 was 140 mm, the spacing S2 between the second elastic portion 4 and the third elastic portion 5 was 20 mm, and the spacing S3 between the pair of third elastic portions 5 was 50 mm. The upper end of the first elastic portion 3 was positioned 10 mm above the upper end of the second elastic portion 4. Thus, the cushion of Example 1 was produced.

[0051] <Example 2> As shown in FIG. 6, the cushion of Example 2 was produced in the same manner as Example 1, except that two rectangular parallelepipeds made of commercially available polyurethane elastomer were added to the cushion of Example 1 as a pair of fourth elastic portions 21.

[0052] Example 3 A cushion of Example 3 was produced as shown in Figures 7 and 8. The dimensions of the first elastic part were 70 mm in the up-down direction (maximum length), 20 mm in the left-right direction, 20 mm in the front-rear direction of the upper part, and 40 mm in the front-rear direction of the lower part, and the dimensional ratios with respect to other members were as shown in Figures 7 and 8.

[0053] <Comparative Example 1> A cushion of Comparative Example 1 was produced in the same manner as in Example 1, except that the first elastic portion was not used.

[0054] <Comparative Example 2> A cushion of Comparative Example 2 was produced in the same manner as in Example 1, except that a pair of second elastic parts was not used.

[0055] <Comparative Example 3> A cushion of Comparative Example 3 was produced in the same manner as in Example 1, except that the pair of third elastic parts was not used.

[0056] <Comparative Example 4> A commercially available cushion was used as the cushion of Comparative Example 4.

[0057] <Evaluation> An adult male was asked to place the cushions of Examples 1 to 4 and Comparative Examples 1 to 4 on a chair and sit on them (see FIG. 3). With the cushions of Examples 1 to 3, it was observed that the pelvis was upright and posture was properly corrected. In particular, Example 3 was the best, followed by Example 2 and Example 1, and it was felt that the subject was able to sit stably via the cushion. On the other hand, with the cushion of Comparative Example 3, posture was not corrected at all, just like the cushion of Comparative Example 4. With Comparative Examples 1 and 2, posture was observed to be slightly improved compared to Comparative Examples 3 and 4, but this was still insufficient. [Explanation of symbols]

[0058] 1 cushion 2 Cushion body 3 First elastic part 4 Second elastic part 5 Third elastic part 6 Posture support 7 Flexible plate member 8 Mounting material 9 Openings 10 Detachment section 11 First belt-shaped member 12 Non-detachable part 13 Second belt-shaped member 20 cushions 21 Fourth elastic part

Claims

1. a first elastic portion for pressing the sacrum; a pair of second elastic portions disposed on both sides of the first elastic portion in the left-right direction and configured to press against hip joints; a pair of third elastic portions disposed above the pair of second elastic portions, respectively, for pressing against the upper portion of the ilium; a cushion main body portion that fixes the first elastic portion, the second elastic portion, and the third elastic portion, The cushion is characterized in that the second elastic portion has a shape that is long in the vertical direction.

2. The first elastic portion has a shape that is long in the vertical direction, The cushion according to claim 1 , wherein the third elastic portion has a shape that is elongated in the left-right direction.

3. The cushion according to claim 1 , wherein a lower portion of the second elastic portion is formed so as to protrude further in a direction away from the cushion body than an upper portion of the second elastic portion.

4. The cushion according to claim 1 , further comprising a pair of fourth elastic portions between the first elastic portion and the pair of second elastic portions for pressing against ischial bones.

5. The cushion according to claim 4 , wherein a lower portion of the fourth elastic portion is formed so as to protrude further in a direction away from the cushion than an upper portion of the fourth elastic portion.

6. a first elastic portion for pressing the sacrum; a pair of second elastic portions disposed on both sides of the first elastic portion in the left-right direction and configured to press against hip joints; a pair of third elastic portions disposed above the pair of second elastic portions, respectively, for pressing against the upper portion of the ilium; a flexible flat plate member that fixes the first elastic portion, the second elastic portion, and the third elastic portion, The posture-maintaining device is characterized in that the second elastic portion has a shape that is long in the vertical direction.

7. The posture supporter according to claim 6 , further comprising a pair of fourth elastic parts for pressing against ischial bones between the first elastic part and the pair of second elastic parts.

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