A seating posture is stabilized for the shoulders of a passenger seated on a vehicle seat. A vehicle seat is provided with a seat back configured to support the seated person from the rear. A shoulder support portion of the seat back configured to support a corresponding one of the shoulders of the seated passenger includes an air cell configured to expand when air is supplied. When the air cell expands, one end portion of the shoulder support portion on the outside in the width direction of the vehicle seat moves more forward than the other end portion of the shoulder support portion on the inside in the width direction.

A sensor disposition structure in a seat includes a cushion pad and a board-like member which is disposed under the cushion pad. A concave is formed in an upper surface of the board-like member, and a sensor is disposed in the concave.

A vehicle seat may have a seat substructure, at least one backrest, and a fastening arrangement for fastening the seat substructure to a base, in particular to a longitudinal adjuster. The seat substructure may have at least two side carriers and a transverse profile, in particular a front transverse tube, connected to the side carriers. The seat substructure may have at least one deformation element for limiting a force acting on the fastening arrangement, in particular a force introduced into the seat substructure via the transverse profile.

A lever assembly includes a lever housing attached to a seat back of a vehicle seat. The lever assembly includes a bracket attached to the lever housing, and the bracket includes a bracket opening. The lever assembly includes a lever bezel including a bezel opening, the lever bezel is received in the lever housing, and the bezel opening aligns with the bracket opening. The lever assembly includes a lever pivotally mounted to the level bezel and a clip received in the bezel opening and the bracket opening to secure the lever bezel to the lever housing.

A seat frame includes a cushion frame, a back frame, a recliner plate, a bracket arranged to be in contact with a side surface of each cushion side frame, a nut, an end nut, a bolt, and an end bolt. The bracket includes a nut fixing portion and a pipe fixing portion. The bolt is fixed to the nut in a state of being inserted through a bolt hole and a bolt insertion hole. The end bolt is fixed to the end nut in a state of being inserted through an end bolt hole.

A seat frame includes a cushion frame, a back frame, a recliner plate, a bracket arranged to be in contact with a side surface of each cushion side frame, a nut, an end nut, a bolt, and an end bolt. The bracket includes a nut fixing portion and a pipe fixing portion. The bolt is fixed to the nut in a state of being inserted through a bolt hole and a bolt insertion hole. The end bolt is fixed to the end nut in a state of being inserted through an end bolt hole.

Provided is a vehicle seat having a seat back that can be folded forward, in which the buckle is prevented from interfering with the seat back when the seat back is folded forward. A seat cushion frame rotatably attached to the seat back frame includes a pair of side frames extending in a fore and aft direction, a front frame extending between front parts of the side frames, and a rear frame extending between rear parts of the side frames and provided with a curved portion protruding forward in a middle part thereof. A buckle support arm is located behind the curved portion, the curved portion being dimensioned so as not to interfere with the buckle when the buckle support arm is in a stowed position.

Provided is a vehicle seat having a seat back that can be folded forward, in which the buckle is prevented from interfering with the seat back when the seat back is folded forward. A seat cushion frame rotatably attached to the seat back frame includes a pair of side frames extending in a fore and aft direction, a front frame extending between front parts of the side frames, and a rear frame extending between rear parts of the side frames and provided with a curved portion protruding forward in a middle part thereof. A buckle support arm is located behind the curved portion, the curved portion being dimensioned so as not to interfere with the buckle when the buckle support arm is in a stowed position.

A vehicle seat with a speaker-equipped headrest is provided, which is of a relatively simple structure to enable the speaker-equipped headrest to be easily mounted to/dismounted from a seat body after vehicle installation, and also provide increased versatility for installation in vehicles of various vehicle size classes. The vehicle seat with the speaker-equipped headrest includes: a male coupler that is connected to a speaker harness and fitted to a distal end of a headrest stay; and a female coupler that is connected to a main harness on a seat body side, and fitted to a headrest guide bracket supporting a headrest guide. Insertion of the headrest stay into the headrest guide allows the speaker-equipped headrest to be mounted to the seat body, and allows the male coupler and the female coupler to be fitted together to provide a connection between the speaker harness and the main harness.

A seat back pad 70 has a groove 73 for tucking a skin material therein, formed at borders between a central portion 71 and side portions 72. A hole (slot hole 74) is formed in a bottom of the groove 73 along the groove 73. A tuck-in wire 76 for tucking the skin material in includes a plurality of tuck-in portions 76A provided along the groove 73, and a connecting portion (detour portion 76B) detouring around the hole and connecting the tuck-in portions 76A. With this configuration, when an upper body of an occupant P subsides into a seat back S2 in a rear-end collision of a vehicle, the central portion 71, defined by the groove 73 as a border, is easily and sufficiently moved rearward relative to the left and right side portions 72. Furthermore, the tuck-in wire 76 is not exposed through the hole, and thus adhesion between the seat back pad 70 and the tuck-in wire 76 can be improved.