Disclosed is a seat recliner for a vehicle, the seat recliner including: a flange provided with internal teeth on an inner circumferential surface thereof; a gear plate disposed in the internal teeth of the flange, provided with external teeth along an edge thereof to be engaged with the internal teeth of the flange with being eccentric with respect to the flange, and formed with a through-hole at a center thereof; a rotating cam disposed at a center of the through-hole of the gear plate; a wedge cam held between the rotating cam and an inner circumferential surface of the through-hole of the gear plate to maintain eccentricity of the rotating cam and the gear plate, and provided with a lubrication part on a contact surface with the rotating cam to preserve lubricant; and an elastic member configured to press the wedge cam.