STRUCTURE FOR VEHICLE SEAT

A seat structure for vehicle includes: fixation members (24) fixed to a floor at positions away from each other in a front-rear direction; a slide rail (12) having an aluminum stationary rail (16) held by the fixation members (24) and a movable rail movable with respect to the stationary rail (16) in the front-rear direction; a seat cushion (6, 8) fixed to the movable rail; a seatback (5, 7) supported by the seat cushion (6, 8); and an iron reinforcement plate (51) fixed to the stationary rail (16) at a position inside a safety-belt used area (27) and outside regions having the fixation members (24).