Abstract: A vehicle seat structure includes: a first side frame (11a) extending in a front-rear direction along one side portion of a seat cushion (4); a second side frame (11b) extending in the front-rear direction along the other side portion of the seat cushion (4); posture changing mechanisms (6, 7) mounted on the first side frame (11a) and capable of changing the posture of the seat cushion (4), and reinforcement members (R1, R2) provided at a portion of the second side frame (11b) where the reinforcement members (R1, R2) overlap the posture changing mechanisms (6, 7) in a side view.

Abstract: A seat slide mechanism (15) includes: a lower rail (16) fixed to a floor pan (1) constituting a part of a vehicle body of a vehicle and extending in front-rear directions of the vehicle; a slider (17) slidable in the lower rail (16) and allowing a seat (10) to be mounted thereabove; and a slide-allowing member (30) arranged between the lower rail (16) and the slider (17) and enabling sliding of the slider (17) along the lower rail (16). The slide-allowing member (30) has a spring constant set to be smaller than a spring constant of the lower rail (16) or a spring constant of the slider (17).

Abstract: A vehicle seat structure includes: a first side frame (11a) extending in a front-rear direction along one side portion of a seat cushion (4); a second side frame (11b) extending in the front-rear direction along the other side portion of the seat cushion (4); posture changing mechanisms (6, 7) mounted on the first side frame (11a) and capable of changing the posture of the seat cushion (4), and reinforcement members (R1, R2) provided at a portion of the second side frame (11b) where the reinforcement members (R1, R2) overlap the posture changing mechanisms (6, 7) in a side view.