Seat reclining device for a vehicle

摘要

A seat reclining device for a vehicle includes a lower arm adapted to be fixedly arranged on a seat cushion member, an upper arm rotatably arranged with respect to the lower arm and adapted to be fixed on a seat back member, and a locking mechanism for locking the upper arm relative to the lower arm. The locking mechanism includes a rotatable cam and a spring. The spring is disposed between the lower arm and the cam to apply a biasing force to the cam. The spring is disposed so as to be wound around the rotational axis of the cam.