Seat recliner for vehicle

A seat recliner for a vehicle, the seat recliner comprising:

• a first flange on which a lock cam is seated at a center part thereof to be rotatable;
• a plurality of lock gears radially disposed around the lock cam;
• a control part disposed on upper parts of the plurality of lock gears, and an upper part of the lock cam, the control part configured to guide lock gears of the plurality of lock gears so that the lock gears slide inward and outward;
• a second flange covering the control part and coupled to be rotatable relative to the first flange, and provided with a through hole at a center part thereof to expose a center part of the control part to outside;
• an input member extended along a central axis of each of the first flange and the second flange, and configured to penetrate through the first flange, the lock cam, the control part, and the second flange in order, wherein an end part of the input member is exposed to outside of the second flange;
• and
• an insert part inserted in the through hole of the second flange, the insert part including:
• an inside surface locked to an outer circumferential surface of the exposed end part of the input member,
• an outside surface supported by an inner circumferential surface of the second flange which defines the through hole, and
• a supporter configured to connect the inside surface and the outside surface of the insert part, and configured to support an exposed upper surface of the control part,
• wherein the inside surface of the insert part is provided with a plurality of slits formed along a radial direction of the insert part, such that the inside surface is divided into a plurality of parts.