Seat back

Abstract

The present invention provides a seatback in which a pad covered with a cover is divided into three sections in the width direction of the seat and attached to the frame, and in which an airbag device can be installed without hindering the deployment of the airbag. [Solution] The cushion structure comprises a frame 4 and a cushion structure 5. The side structure 20 of the cushion structure 5 comprises a side pad 22, a side cover 23, and a side support member 21. A deformable portion 21c is formed in the side support member 21 of the side structure 20, which has an airbag device 6 disposed inside. The first cover portion 23a, the second cover portion 23b, the front reinforcing fabric 65, and the connecting reinforcing fabric 67 are connected by the first sewing portion 23c. The second cover portion 23b, the connecting reinforcing fabric 67, and the rear reinforcing fabric 66 are connected to the resin plate 23e by the second sewing portion 23d. The resin plate 23e is inserted into the seat width direction inward of the deformable portion 21c, and the first sewing portion 23c is ruptured by the deployment pressure of the airbag 61.

Description

Technical Field

[0001] The present invention relates to a seat back. More specifically, it relates to a seat back having an airbag device disposed therein.

Background Art

[0002] Conventionally, in a seat back of a vehicle seat equipped in a vehicle such as an automobile, there is known a structure in which a seat back pad covered with a seat back cover is divided into three parts in the seat width direction and attached to a seat back frame. Patent Document 1 discloses a seat back configured such that a seat back main part at the center in the seat width direction and a seat back side part disposed at a side part of the seat back main part are attached to a seat back frame. Such a vehicle seat aims to have good assemblability and be easy to automate the assembly, and to be easy to replace only the seat back side part that is likely to deteriorate when the occupant gets on and off.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the automobile seat described in Patent Document 1 above, a configuration is adopted in which an insert wire or a plate for attachment to a seat back frame is incorporated in the seat side back part. As a result, it has been difficult to configure the airbag device to be disposed in the seat side back part because the deployment of the airbag may be hindered by the insert wire or the seat back frame.

[0005] In view of these problems, the object of the present invention is to provide a seat back in which an airbag device can be installed without hindering the deployment of the airbag, in a seat back in which a seat pad covered with a seat cover is divided into three parts in the seat width direction and attached to a frame. [Means for solving the problem]

[0006] The first invention of the present invention is a seat back comprising a frame forming a skeleton and a cushion structure attached to the frame to elastically support a seated occupant, wherein the cushion structure comprises a main structure in the center in the seat width direction and a pair of left and right side structures arranged on both sides of the main structure, wherein the main structure comprises a main pad which is a cushion body, a main cover which covers the main pad, and a main support member which is attached to the frame side of the main pad and supports the main pad in a planar manner, wherein the side structure comprises a side pad which is a cushion body, a side cover which covers the side pad, and a side support member which is attached to the frame side of the side pad and supports the side pad in a planar manner, wherein at least one of the side structures is equipped with an airbag device which expands forward, and the outer peripheral edge of the side support member of the side structure equipped with the airbag device is formed on the outer side in the seat width direction with a folded portion having a substantially U-shaped cross section which opens toward the rear, and the airbag device is located on the front side of the side support member The side structure is formed by placing the side pad with the seat covered, covering it with the side cover from the front, and inserting a strip-shaped resin plate attached by sewing at the second sewing section into the inside of the folded portion in the seat width direction at the outer end of the side cover in the seat width direction. The side cover is formed by integrating a main part which covers the side pad and a sub-part which covers the side of the folded portion by sewing them together at the first sewing section which extends along the front end of the folded portion, and the airbag device The other end of a first reinforcing fabric, one end of which is fixed to the frame and positioned on the front side of the side cover, is less stretchable than the side cover, and the other end of a second reinforcing fabric, one end of which is fixed to the frame and positioned on the rear side of the airbag device, is integrated with the main part and the sub-part by sewing at the first sewing section, the second reinforcing fabric has a main fabric portion from the one end to the second sewing section and a sub-fabric portion from the other end to the second sewing section, and the main fabric portion, the sub-fabric portion and the sub-part are connected to the resin plate at the second sewing section.The first seam is characterized by being ruptured by the deployment pressure when the airbag of the airbag device is deployed.

[0007] According to the first invention, a side structure can be formed by placing a side pad on the front side of the side support member, covering it with a side cover, and inserting a resin plate into the inside of the folded portion in the seat width direction. When the airbag of the airbag device deploys, the force applied through the first and second reinforcing fabrics causes the first stitching to break, allowing the airbag to inflate forward from between the main and sub-parts of the side cover. In other words, the airbag device can be attached to a split-type seat back equipped with a main structure and each side structure without any reduction in functionality. Furthermore, since the second reinforcing fabric is divided into a main fabric part and a sub-fabric part, and one end of the main fabric part and the opposite end are connected to the resin plate by the second stitching, and the resin plate is inserted and fixed into the inside of the folded portion in the seat width direction, when one end of the main fabric part is fixed to the frame, no force is applied to the first stitching, and the irregular bending of the first stitching, which would worsen the appearance, can be suppressed.

[0008] The second invention of the present invention is a seat back comprising a frame forming a skeleton and a cushion structure attached to the frame for elastically supporting a seated occupant, wherein the cushion structure comprises a main structure in the center in the seat width direction and a pair of left and right side structures arranged on both sides of the main structure, wherein the main structure comprises a main pad which is a cushion body, a main cover which covers the main pad, and a main support member which is attached to the frame side of the main pad and supports the main pad in a planar manner, wherein the side structure comprises a side pad which is a cushion body, a side cover which covers the side pad, and a side support member which is attached to the frame side of the side pad and supports the side pad in a planar manner, wherein at least one of the side structures is provided with an airbag device which expands forward, and the outer peripheral edge of the side support member of the side structure provided with the airbag device is formed on the outer side in the seat width direction with a folded portion having a substantially U-shaped cross-section which opens toward the rear, and the front side of the side support member The side structure is formed by placing the side pad with the airbag device covered, covering it with the side cover from the front, and inserting a strip-shaped resin plate attached by sewing in the second sewing section into the inside of the folded portion in the seat width direction at the outer end of the side cover in the seat width direction. The side cover is formed by integrating a main portion, which is the part that covers the side pad, and a sub-part, which is the part that covers the side of the folded portion, by sewing them together in the first sewing section that extends along the front end of the folded portion. The first reinforcing fabric, one end of which is fixed to the frame and positioned on the front side of the airbag device, has a less stretchable end than the side cover, and the other end of which is fixed to the frame and positioned on the rear side of the airbag device, has a less stretchable end than the side cover, and these are integrated with the main part and the sub-part by sewing at the first sewing section, the second reinforcing fabric is positioned in contact with the corner portion of the front end of the folded portion, and the first sewing section is characterized in that it is ruptured by the deployment pressure when the airbag of the airbag device is deployed.

[0009] According to the second invention, a side structure can be formed by placing a side pad on the front side of the side support member, covering it with a side cover, and inserting a resin plate into the inner side of the folded portion in the seat width direction. When the airbag of the airbag device deploys, the force applied through the first and second reinforcing fabrics causes the first seam to break, allowing the airbag to inflate forward from between the main and sub-parts of the side cover. In other words, the airbag device can be attached to a split-type seat back equipped with a main structure and each side structure without any reduction in functionality. Furthermore, since the second reinforcing fabric is positioned in contact with the corner portion of the front end of the folded portion, when one end of the second reinforcing fabric is fixed to the frame, the frictional force at the corner portion reduces the load applied to the first seam, preventing the first seam from bending irregularly and degrading its appearance. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view of an automotive seat with a seatback attached according to one embodiment of the present invention. [Figure 2] The above is an exploded perspective view of the seat back. [Figure 3] This is a front view of the seat back shown above. Because it is symmetrical, only the right side is shown. Furthermore, only the frame and the side support members of the side structure are shown. [Figure 4] This is a cross-sectional view taken along the line IV-IV in Figure 3. It shows the side structure including the back pad, back cover, and main structure. [Figure 5] This is a cross-sectional view taken along the VV arrow in Figure 3. It shows the side structure including the back pad, back cover, and main structure. [Figure 6] This is a schematic diagram showing an enlarged view of section VI in Figure 4. [Figure 7] This is a cross-sectional view corresponding to Figure 4 illustrating another embodiment of the present invention. [Figure 8] This is a schematic diagram showing an enlarged view of section VIII in Figure 7. [Modes for carrying out the invention]

[0011] Based on Figures 1 to 6, the seat back 3 of the automobile seat 1 according to one embodiment of the present invention will be described. In the following description, the description of direction will be based on the up, down, front, back, left, and right directions shown in each figure. Here, the up, down, front, back, left, and right directions are defined based on the automobile seat 1 when it is mounted on the floor F of the automobile. The left and right direction coincides with the seat width direction.

[0012] As shown in Figure 1, the automobile seat 1 includes a seat cushion 2 that supports the buttocks and thighs of the seated occupant, and a seat back 3 that supports the waist and back of the seated occupant.

[0013] As shown in Figures 1 and 2, the seat back 3 comprises a frame 4 that forms the skeleton, a cushion structure 5 mounted on the frame 4 that has a cushioning function and defines the outer shape of the seat back 3, and a pair of left and right airbag devices 6.

[0014] As shown in Figures 1 and 2, the frame 4 has a pair of left and right side frames 41 extending vertically on both the left and right sides of the seat back 3, an upper frame 42 connecting the upper ends of each side frame 41, and a lower frame 43 connecting the lower ends of each side frame 41. The frame 4 is formed in a substantially rectangular frame shape when viewed from the front. A lumbar plate 44 is disposed between the upper frame 42 and the lower frame 43 of the frame 4. This lumbar plate 44 is the same as that disclosed in Japanese Patent Application Publication No. 2015-209062.

[0015] As shown in Figures 1 to 5, the cushion structure 5 has a main structure 10 in the center in the width direction of the seat, and a pair of left and right side structures 20 on both sides of the main structure 10. The main structure 10 is the part that supports the lumbar and back of the seated occupant from the rear, and the pair of left and right side structures 20 are the parts that support the lumbar and back of the seated occupant from the sides.

[0016] The main structure 10 includes a resin-made main support member 11, a main pad 12 which is a cushion body disposed on the front side of the main support member 11 and supported by the main support member 11 against the frame 4, and a main cover 13 which covers the main pad 12 from the front side.

[0017] The rear face portion of the upper part of the main support member 11 is fixed to the upper frame 42, the rear face portion of the substantially central part in the vertical direction is fixed to the lamb plate, and the rear face portion of the lower part is fixed to the lower frame 43.

[0018] The main pad 12 is an elastic body made of a foamed molded body of polyurethane resin and has substantially the same outer shape as the main support member 11 when viewed from the front. The main cover 13 is a bag-shaped cover member formed by sewing a plurality of pieces together and opening toward the rear. The main structure 10 is formed by covering the main pad 12 disposed on the front side of the main support member 11 from the front side and locking the terminal portion of the rear opening to the rear face portion of the outer peripheral edge of the main support member 11.

[0019] As shown in FIGS. 2 to 5, the side structure 20 includes a resin-made side support member 21, a side pad 22 which is a cushion body disposed on the front side of the side support member 21 and supported by the side support member 21 against the frame 4, and a side cover 23 which covers the side pad 22 from the front side.

[0020] As shown well in FIG. 3, the side support member 21 is a member extending in the vertical direction, and a through hole 21a extending in the vertical direction and penetrating in the front-rear direction is formed at substantially the center in the left-right direction. The left side (inside the seat) of the through hole 21a is a base portion 21b extending vertically along the front side of the side frame 41 of the frame 4, and the right side (outside the seat) of the through hole 21a is a deformed portion 21c. The deformed portion 21c is formed in a substantially U shape whose horizontal cross section opens toward the rear (see FIGS. 4 and 5). A weakened portion 21d connecting the lower end portion side of the base portion 21b and the lower end portion side of the deformed portion 21c is formed below the through hole 21a. Above the through hole 21a, the upper end portion of the deformed portion 21c is gradually curved leftward (inside the seat direction) as it goes upward with respect to the upper end portion side of the base portion 21b and is connected, and an R portion 21e having an R shape when viewed from the front is formed between the base portion 21b and the deformed portion 21c. The side support member 21 is fixed to the frame 4 at the rear surface portion (not shown) at substantially the center in the vertical direction of the base portion 21b and at the weakened portion 21d. Here, the deformed portion 21c corresponds to the “folding-back portion” in the claims.

[0021] As shown well in FIGS. 3 and 5, the weakened portion 21d has a rectangular attachment portion 21g when viewed from the front and a bent portion 21h whose cross section cut by a horizontal plane is Z-shaped. The upper end portion of the bent portion 21h is connected to the deformed portion 21c, and the lower end portion of the bent portion 21h is connected to the right end portion of the attachment portion 21g. And the outer bent portion 21k which is the bent portion on the right side (outside the seat) of the bent portion 21h is made easily breakable by the load in the right direction (outside the seat direction) applied to the deformed portion 21c by the deployment of the airbag with a thin wall thickness. The attachment portion 21g is fixed to the bracket 41a of the side frame 41 by a clip 21m passed through a clip hole not shown.

[0022] As shown in Figures 2, 4, and 5, the side pad 22 is an elastic body made of foamed polyurethane resin and has an external shape that is almost the same as that of the side support member 21 when viewed from the front. The portion of the side support member 21 corresponding to the through hole 21a is formed to cover the front part of the airbag device 6 which is positioned to close the through hole 21a, and no hole is provided that penetrates in the front-to-back direction. The side cover 23 is a bag-shaped cover member that opens toward the rear and is formed by integrating a plurality of pieces by sewing together. The side structure 20 is formed when the side cover 23 is placed over the side pad 22 which is positioned in front of the side support member 21 from the front and the end portion of the rear opening is locked to the rear outer edge of the side support member 21. As shown in Figures 4 and 6, the side cover 23 has a first cover portion 23a that covers the front and right sides of the side pad 22 and a second cover portion 23b that covers the right side of the side support member 21. The right end of the first cover portion 23a and the upper right end of the second cover portion 23b are connected by the first sewing portion 23c. The upper left end of the second cover portion 23b is connected to the resin plate 23e by the second sewing portion 23d, together with the upper left end of the connecting reinforcement fabric 67, which will be described later. Here, the first cover portion 23a and the second cover portion 23b correspond to the "main portion" and the "sub-part" in the claims, respectively.

[0023] The airbag device 6 is attached to the outer surface of the seat on the left and right side frames 41. Since it is roughly symmetrical, the right airbag device 6 will be described as a representative example. As shown in Figures 2 to 5, the airbag device 6 is formed in a vertically elongated box shape that extends in a long length in the vertical direction, and when viewed from the front, its external shape is designed to substantially match the shape of the through hole 21a of the side support member 21. The airbag device 6 has an airbag 61, an inflator 62, a case 63, and a reinforcing cloth 64. The airbag device 6 receives a vehicle collision detection signal from the vehicle's ECU (not shown), injects gas from the inflator 62 into the airbag 61, inflating the airbag 61 and deploying it toward the front of the seat.

[0024] Case 63 is a vertically elongated box-shaped container that houses the airbag 61 and the inflator 62, with its left side fixed to the side frame 41. When the airbag 61 inflates and deploys, Case 63 is pushed open through a slit (not shown) to inflate and deploy the airbag 61 forward.

[0025] As shown in Figures 4 and 6, the reinforcing fabric 64 is a guide fabric that does not stretch easily and restricts the deployment direction of the airbag 61, and has a front reinforcing fabric 65 disposed on the front side, a rear reinforcing fabric 66 disposed on the rear side, and a connecting reinforcing fabric 67 disposed between the front reinforcing fabric 65 and the rear reinforcing fabric 66. The right end of the front reinforcing fabric 65 (corresponding to the "other end" in the claims), the right end of the first cover portion 23a, the upper right end of the second cover portion 23b, and the upper right end of the connecting reinforcing fabric 67 (corresponding to the "other end" in the claims) are superimposed in this order and connected by the first sewing portion 23c. The right end of the rear reinforcing fabric 66, the upper left end of the connecting reinforcing fabric 67, and the upper left end of the second cover portion 23b are superimposed in this order and connected to the resin plate 23e by the second sewing portion 23d. The resin plate 23e is positioned on the inner part of the U-shape of the deformed portion 21c of the side support member 21, thereby fixing the right side of the side cover 23 to the side support member 21. The left end of the front reinforcing cloth 65 is fixed to the frame 4 by a fixing member (not shown). The left end of the rear reinforcing cloth 66 is fixed to the frame 4 by a fixing member 66a. Here, the front reinforcing cloth 65 corresponds to the "first reinforcing cloth" in the claims. The rear reinforcing cloth 66 and the connecting reinforcing cloth 67 together correspond to the "second reinforcing cloth" in the claims. The rear reinforcing cloth 66 and the connecting reinforcing cloth 67 correspond to the "main cloth portion" and the "sub-cloth portion" in the claims, respectively.

[0026] The assembly procedure for the seat back 3 will now be described. First, as shown in Figures 3 to 5, the airbag device 6 is attached to the outer surface of each side frame 41 on the frame 4. Next, the pre-assembled left and right side structures 20 are attached to the frame 4. At this time, each airbag device 6 is positioned inside each side structure 20 so that it passes through each through hole 21a of each side support member 21 in each side structure 20. At this time, the left end of the front reinforcement fabric 65 (corresponding to "one end" in the claims) is fixed to the frame 4 by a fixing member (not shown), and the rear reinforcement fabric 66 is positioned in contact with the front surface of the deformation part 21c and its left end (corresponding to "one end" in the claims) is fixed to the frame 4 by a fixing member 66a. Next, the main structure 10 is attached to the frame 4. Note that when removing the main structure 10 and each side structure 20 from the frame 4, the reverse procedure of the above is followed. Finally, a backboard (not shown) is attached to the rear side of the frame 4 to conceal the rear side of the frame 4.

[0027] As described above, the assembled seat back 3 is attached to the seat cushion 2 as shown in Figure 1 to form the automobile seat 1 and is fixed to the floor F. In this state, when a vehicle collision detection signal is received from the vehicle's ECU, gas is injected from the inflator 62 into the airbag 61, inflating the airbag 61 and deploying it toward the front of the seat. At this time, as shown in Figure 3, as the airbag 61 deploys and reaches the deployed state 61E, the outer bent portion 21k (see Figure 5) of the weakened portion 21d breaks, causing the deformed portion 21c of the side support member 21 to rotate to the right around its upper end and reach the deformed state 21cE. In parallel, as the airbag 61 deploys and reaches the deployed state 61E, the tensile force applied by the front reinforcing fabric 65, the rear reinforcing fabric 66 and the connecting reinforcing fabric 67 causes the first stitched portion 23c to break, and the airbag 61 deploys toward the front of the seat back 3 from between the first cover portion 23a and the second cover portion 23b. At this time, even if the resin plate 23e detaches from the inner U-shaped portion of the deformed portion 21c, the rear reinforcing fabric 66 and the connecting reinforcing fabric 67 are connected at the second sewing portion 23d, so a tensile force is reliably applied to the first sewing portion 23c and the first sewing portion 23c breaks.

[0028] As described above, this embodiment provides the following effects. With the side pad 22 positioned in front of the side support member 21, the side structure 20 can be formed by covering it with the side cover 23 and inserting the resin plate 23e into the seat width direction of the deformable portion 21c. When the airbag 61 of the airbag device 6 is deployed, the force applied via the front reinforcing fabric 65, rear reinforcing fabric 66, and connecting reinforcing fabric 67 causes the first stitched portion 23c to rupture, allowing the airbag 61 to inflate forward from between the first cover portion 23a and the second cover portion 23b of the side cover 23. In other words, the airbag device 6 can be attached to a split-type seat back 3 comprising a main structure 10 and each side structure 20 without any reduction in functionality. Furthermore, the right end of the rear reinforcement fabric 66 is connected to the resin plate 23e by the second sewing portion 23d, and the resin plate 23e is inserted into the inside of the deformable portion 21c in the sheet width direction and fixed. Therefore, when the left end of the rear reinforcement fabric 66 is fixed to the frame 4, no force is applied to the first sewing portion 23c, which prevents the first sewing portion 23c from bending irregularly and deteriorating the appearance.

[0029] Another embodiment of the present invention will be described based on Figures 7 and 8. The difference from the above embodiment is that there is no connecting force fabric 67, and the front force fabric 65 and the rear force fabric 66 are directly connected, and the rear force fabric 66 abuts against the front inner corner portion 21f of the deformed portion 21c of the side support member 21. Components identical to those in the above embodiment are denoted by the same reference numerals and their description is omitted. The right end of the front force fabric 65 (corresponding to the "other end" in the claims), the right end of the first cover portion 23a, the upper right end of the second cover portion 23b, and the right end of the rear force fabric 66 (corresponding to the "other end" in the claims) are superimposed in this order and connected by the first sewing portion 23c. The upper left end of the second cover portion 23b is connected to the resin plate 23e by the second sewing portion 23d. The resin plate 23e is positioned on the inner part of the U-shape of the deformed portion 21c of the side support member 21, thereby fixing the right side of the side cover 23 to the side support member 21. The left end of the front reinforcing cloth 65 is fixed to the frame 4 by a fixing member (not shown). The left end of the rear reinforcing cloth 66 is fixed to the frame 4 by a fixing member 66a. Here, the front reinforcing cloth 65 corresponds to the "first reinforcing cloth" in the claims. The rear reinforcing cloth 66 corresponds to the "second reinforcing cloth" in the claims.

[0030] The assembly procedure for the seat back 3 is the same as in the above embodiment. In the process of the airbag 61 deploying to the deployed state 61E, the tensile force applied by the front reinforcing fabric 65 and the rear reinforcing fabric 66 causes the first seam 23c to break, and the airbag 61 deploys forward from between the first cover portion 23a and the second cover portion 23b.

[0031] As described above, this embodiment provides the following effects. With the side pad 22 positioned in front of the side support member 21, the side structure 20 can be formed by covering it with the side cover 23 and inserting the resin plate 23e into the seat width direction of the deformable portion 21c. When the airbag 61 of the airbag device 6 is deployed, the force applied via the front reinforcing fabric 65 and rear reinforcing fabric 66 causes the first stitched portion 23c to break, allowing the airbag 61 to inflate forward from between the first cover portion 23a and the second cover portion 23b of the side cover 23. In other words, the airbag device 6 can be attached to a split-type seat back 3 comprising a main structure 10 and each side structure 20 without any reduction in functionality. Furthermore, since the rear reinforcement fabric 66 is positioned in contact with the front inner corner portion 21f of the deformed portion 21c, when one end of the rear reinforcement fabric 66 is fixed to the frame 4, the frictional force at the front inner corner portion 21f reduces the load applied to the first sewing portion 23c, thereby preventing the first sewing portion 23c from bending irregularly and deteriorating its appearance. Here, the front inner corner portion 21f corresponds to the "corner portion" in the claims.

[0032] Although specific embodiments have been described above, the present invention is not limited to their appearance and configuration, and various modifications, additions, and deletions are possible without altering the essence of the invention. For example, the following can be made.

[0033] 1. In the above embodiment, airbag devices 6 are provided on both the left and right sides, but the seatback is not limited to this, and may have airbag devices 6 provided on only one side, either the left or the right.

[0034] 2. In the above embodiment, the present invention was applied to the seat back 3 of an automobile seat 1, but it is not limited to this and can also be applied to seats in railway vehicles. [Explanation of Symbols]

[0035] 1. Automotive seats 3 Seatback 4 frames 5. Cushion structure 6. Airbag system 10 Main Structure 11 Main support member 12 Main Pad 13 Main Cover 20 Side Structures 21 Side support member 21c Deformed section (folded section) 21f Front inner corner section (corner section) 22 Side Pads 23 Side cover 23a First cover section (main section) 23b Second Cover Section (Sub-section) 23c 1st sewing section 23d 2nd sewing section 23e Resin Plate 61 Airbags 64 Rikifu 65 Front Rikifu (1st Rikifu) 66 Back force cloth (main cloth part, 2nd force cloth) 67 Connecting force cloth (secondary force cloth part, second force cloth)

Claims

1. It is a seat back, It has a frame that forms the skeleton and a cushion structure attached to the frame that elastically supports the seated occupant, The cushion structure consists of a main structure in the center in the width direction of the seat, and a pair of left and right side structures positioned on both sides of the main structure. The main structure comprises a main pad which is a cushioning body, a main cover which covers the main pad, and a main support member which is attached to the frame side of the main pad and supports the main pad in a planar manner. The side structure comprises a side pad which is a cushioning body, a side cover which covers the side pad, and a side support member which is attached to the frame side of the side pad and supports the side pad in a planar manner. At least one of the side structures is equipped with an airbag device that expands forward. The side support member of the side structure on which the airbag device is installed has a folded portion formed on the outer peripheral edge in the seat width direction, which has a substantially U-shaped cross-section that opens toward the rear. The side structure is formed by placing the side pad on the front side of the side support member with the airbag device covered, covering it with the side cover from the front, and inserting a strip-shaped resin plate attached by sewing in the second sewing section into the inside of the folded portion in the seat width direction at the outer end of the side cover in the seat width direction. The side cover is formed by sewing together a main portion, which covers the side pad, and a secondary portion, which covers the side of the folded portion, at a first sewing section that extends along the front end of the folded portion. The other end of a first reinforcing fabric, one end of which is fixed to the frame and positioned on the front side of the airbag device, is less stretchable than the side cover, and the other end of a second reinforcing fabric, one end of which is fixed to the frame and positioned on the rear side of the airbag device, is less stretchable than the side cover, and these are integrated with the main part and the sub-part by sewing at the first sewing section. The second reinforcing fabric has a main fabric portion from one end to the second sewing portion and a secondary fabric portion from the other end to the second sewing portion. The main fabric portion, the sub-fabric portion, and the sub-part are connected to the resin plate in the second sewing portion. The first sewing portion is a seat back that is ruptured by the deployment pressure when the airbag of the airbag device is deployed.

2. It is a seat back, It has a frame that forms the skeleton and a cushion structure attached to the frame that elastically supports the seated occupant, The cushion structure consists of a main structure in the center in the width direction of the seat, and a pair of left and right side structures positioned on both sides of the main structure. The main structure comprises a main pad which is a cushioning body, a main cover which covers the main pad, and a main support member which is attached to the frame side of the main pad and supports the main pad in a planar manner. The side structure comprises a side pad which is a cushioning body, a side cover which covers the side pad, and a side support member which is attached to the frame side of the side pad and supports the side pad in a planar manner. At least one of the side structures is equipped with an airbag device that expands forward. The side support member of the side structure on which the airbag device is installed has a folded portion formed on the outer peripheral edge in the seat width direction, which has a substantially U-shaped cross-section that opens toward the rear. The side structure is formed by placing the side pad on the front side of the side support member with the airbag device covered, covering it with the side cover from the front, and inserting a strip-shaped resin plate attached by sewing in the second sewing section into the inside of the folded portion in the seat width direction at the outer end of the side cover in the seat width direction. The side cover is formed by sewing together a main portion, which covers the side pad, and a secondary portion, which covers the side of the folded portion, at a first sewing section that extends along the front end of the folded portion. The other end of a first reinforcing fabric, one end of which is fixed to the frame and positioned on the front side of the airbag device, is less stretchable than the side cover, and the other end of a second reinforcing fabric, one end of which is fixed to the frame and positioned on the rear side of the airbag device, is less stretchable than the side cover, and these are integrated with the main part and the sub-part by sewing at the first sewing section. The second reinforcing fabric is arranged to abut against the corner portion of the front end of the folded portion, The first sewing portion is a seat back that is ruptured by the deployment pressure when the airbag of the airbag device is deployed.

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