A seat reclining apparatus for a vehicle, includes a rail member, a slider, a lock apparatus, a striker, a rotating member provided between the rail member and the slider and including a large diameter portion and a small diameter portion, the large diameter portion engaging the rail member along a longitudinal direction of the rail member, and the small diameter portion engaging the slider along a longitudinal direction of the rail member and the striker adapted to engage a lock member attached to the seat back in order to maintain an angle of the seat back.