Patent ID: 8235466

Claim:
A seat structure comprising: a seat side portion provided at a left-right direction side portion of a seat back; and a link mechanism that, along with supporting the seat side portion, is joined to at least one of a seat cushion and a vehicle side, wherein when a seat is in a condition of use, an operation of the link mechanism is locked, wherein the link mechanism is operated by operation of at least one of the seat back and the seat cushion and flexes a thickness of the seat side portion, and wherein the link mechanism includes: a back main frame provided inside the seat back; a back flexing component including a back face side frame, which is provided in the seat back at a face side relative to the back main frame, and a first link, which is turnably joined to the back main frame and the back face side frame; and a back joint mechanism that is joined to the back flexing component, at the face side of the seat back relative to a position of joining to the back main frame of the first link, and operates the back flexing component in accordance with operation of at least one of the seat back and the seat cushion.