SEAT RECLINER FOR VEHICLES

A seat recliner for vehicles includes a mobile flange provided such that an upper part thereof is open and configured to define a seating space through a bottom surface and a side surface and to have an internal gear formed along an inner side of the side surface, and a support groove formed between upper ends of the internal gear and the side surface, a gear plate inserted into the seating space of the mobile flange, and configured to have an external gear formed along an outer side of a side surface of the gear plate, and a support configured to extend outwards from an upper end of the external gear and located in the support groove, and a retainer configured to cover both upper parts of the mobile flange and the gear plate, and fixed to an upper end of the mobile flange.