A seat reclining apparatus for a vehicle includes a first arm arranged at a seat cushion, a second arm arranged at a seat back, an internal gear formed at the first arm, an external gear formed at the second arm and engaging with the internal gear, a first circumferential portion formed coaxially with the internal gear, a second circumferential portion formed coaxially with the external gear, first and second wedge members accommodated in an accommodating space formed between the first and second circumferential portions, a spring arranged between the first and second wedge members and biasing the first and second wedge members, a drive shaft rotating around a rotation axis of either one of the first and second arms, and a retention groove retaining a lubricant, formed on the circumferential contact surface of each of the first and second wedge members, and extending along a direction of the rotation axis.