Abstract: A seat device includes a seat cushion where a sitting person is seated, and a seatback configured to support the upper body of the sitting person. The seatback includes a seatback frame, a seatback pad placed on a front face of the seatback frame, and a seatback cover covering a surface of the seatback pad. A plurality of stretch airbags is provided in a part of the seatback at a position corresponding to the lumbar part of the sitting person, and the stretch airbags are configured to inflate and press a surface of the seatback to a direction approaching the sitting person. The stretch airbags are placed to overlap each other in a thickness direction of the seatback such that the seatback pad is sandwiched between the stretch airbags.

Abstract: A seat device includes a seat cushion where a sitting person is seated, and a seatback configured to support the upper body of the sitting person. The seatback includes a seatback frame, a seatback pad placed on a front face of the seatback frame, and a seatback cover covering a surface of the seatback pad. A plurality of stretch airbags is provided in a part of the seatback at a position corresponding to the lumbar part of the sitting person, and the stretch airbags are configured to inflate and press a surface of the seatback to a direction approaching the sitting person. The stretch airbags are placed to overlap each other in a thickness direction of the seatback such that the seatback pad is sandwiched between the stretch airbags.

Abstract: A vehicle seat includes: a seat frame; a seat pad; and a planar body configured to support, from a backside, the seat pad, and including a high-elongation part more easily extensible than other planar-body part. The planar body includes a low-density region, a high-density region, and a medium-density region in which constituent yarns are placed more thickly than the low-density region, but more thinly than the high-density region, the medium-density region being provided between the low-density region and the high-density region adjacent to each other. The low-density region is placed in the high-elongation part so that the high-elongation part is easily extensible. The high-density region and the medium-density region are placed in the other planar-body part so that the other planar-body part is less easily extensible. The medium-density region in the other planar-body part is adjacent to the high-elongation part.

Abstract: A vehicle seat includes a seat back frame having a pair of side frames; a back panel main body constituted of resin and having a main wall and projections, the projections projecting away from the main wall to a seat width direction outer side; and back panel supports constituted of a resiliently deformable metal material and that each includes an attachment plate portion and a joining plate portion. The attachment plate portion is disposed along and is attached to a side wall portion of one of the pair of side frames, and the joining plate portion projects from an edge of the attachment plate portion toward the projection and is integrally joined to the projection.

Abstract: A vehicle seat includes: a seat frame; a seat pad; and a planar body configured to support, from a backside, the seat pad, and including a high-elongation part more easily extensible than other planar-body part. The planar body includes a low-density region, a high-density region, and a medium-density region in which constituent yarns are placed more thickly than the low-density region, but more thinly than the high-density region, the medium-density region being provided between the low-density region and the high-density region adjacent to each other. The low-density region is placed in the high-elongation part so that the high-elongation part is easily extensible. The high-density region and the medium-density region are placed in the other planar-body part so that the other planar-body part is less easily extensible. The medium-density region in the other planar-body part is adjacent to the high-elongation part.

Abstract: A vehicle seat includes a seat back frame having a pair of side frames; a back panel main body constituted of resin and having a main wall and projections, the projections projecting away from the main wall to a seat width direction outer side; and back panel supports constituted of a resiliently deformable metal material and that each includes an attachment plate portion and a joining plate portion. The attachment plate portion is disposed along and is attached to a side wall portion of one of the pair of side frames, and the joining plate portion projects from an edge of the attachment plate portion toward the projection and is integrally joined to the projection.