Disclosed herein is a recliner for a vehicle seat including an external gear bracket having an external gear, an internal gear bracket which has an internal gear and is formed with a central protrusion, a socket which is formed with a socket protrusion and has an operation protrusion, and a pair of wedge blocks configured to surround the central protrusion. The socket includes a lubrication pocket for supplying a lubricating substance to the central protrusion of the internal gear bracket or the bush, and thus may improve durability of each component by constantly supplying the lubricating substance between the central protrusion of the internal gear bracket and the operation protrusion of the socket, between the operation protrusion of the socket and the bush, and between the bush and the wedge blocks.