An occupant protection system includes: arm rests that are disposed on first and second width direction sides of a seat back and are rotatable between a substantially vertical storage position and a substantially horizontal use position; slide members that are slidable along the arm rests and have belt guides; a retractor that takes up webbing of a belt; and an electronic control unit that, (i) in a state before an occupant is seated in a vehicle seat, causes the arm rests to be held in the storage position and causes the slide members to slide in the seat upward direction above the head of the occupant, and that, (ii) when the occupant is seated, causes the arm rests to rotate to the use position, causes the slide members to slide toward base sides of the arm rests, and causes the webbing to be taken up by the retractor.

An occupant protection system includes: arm rests that are disposed on first and second width direction sides of a seat back and are rotatable between a substantially vertical storage position and a substantially horizontal use position; slide members that are slidable along the arm rests and have belt guides; a retractor that takes up webbing of a belt; and an electronic control unit that, (i) in a state before an occupant is seated in a vehicle seat, causes the arm rests to be held in the storage position and causes the slide members to slide in the seat upward direction above the head of the occupant, and that, (ii) when the occupant is seated, causes the arm rests to rotate to the use position, causes the slide members to slide toward base sides of the arm rests, and causes the webbing to be taken up by the retractor.

In a buckle device, a pressing force, applied from wire ropes to an inside wall face of a wire guide groove of a wire guide, is along an imaginary line passing through a center of a cover plate first hole portion of a cover plate fixing tab of a cover plate and a center of a wire guide hole portion of the wire guide as viewed from the vehicle inside, similarly to a pressing force applied to a first fixing bolt that fixes the cover plate to a support plate, and these pressing forces are both oriented in the same direction. This enables rotation moment to be suppressed from occurring at the cover plate when the wire ropes are pulled toward their length direction leading end side.

In a buckle device, a pressing force, applied from wire ropes to an inside wall face of a wire guide groove of a wire guide, is along an imaginary line passing through a center of a cover plate first hole portion of a cover plate fixing tab of a cover plate and a center of a wire guide hole portion of the wire guide as viewed from the vehicle inside, similarly to a pressing force applied to a first fixing bolt that fixes the cover plate to a support plate, and these pressing forces are both oriented in the same direction. This enables rotation moment to be suppressed from occurring at the cover plate when the wire ropes are pulled toward their length direction leading end side.

An occupant protection system includes: arm rests that are disposed on first and second width direction sides of a seat back and are rotatable between a substantially vertical storage position and a substantially horizontal use position; slide members that are slidable along the arm rests and have belt guides; a retractor that takes up webbing of a belt; and an electronic control unit that, (i) in a state before an occupant is seated in a vehicle seat, causes the arm rests to be held in the storage position and causes the slide members to slide in the seat upward direction above the head of the occupant, and that, (ii) when the occupant is seated, causes the arm rests to rotate to the use position, causes the slide members to slide toward base sides of the arm rests, and causes the webbing to be taken up by the retractor.

An occupant protection system includes: arm rests that are disposed on first and second width direction sides of a seat back and are rotatable between a substantially vertical storage position and a substantially horizontal use position; slide members that are slidable along the arm rests and have belt guides; a retractor that takes up webbing of a belt; and an electronic control unit that, (i) in a state before an occupant is seated in a vehicle seat, causes the arm rests to be held in the storage position and causes the slide members to slide in the seat upward direction above the head of the occupant, and that, (ii) when the occupant is seated, causes the arm rests to rotate to the use position, causes the slide members to slide toward base sides of the arm rests, and causes the webbing to be taken up by the retractor.