The seat reclining device

The present invention discloses a seat reclining apparatus (2), comprising: a first element (11), the first element is attached to the seat back frame (3) and one of the cushion frame (4); a second element (15), the second element is attached to the other of the seat back frame and the seat cushion frame; and a cam member (13), the engaging member so that movement of the cam member so that the engagement portion (11a) achieved between the engagement member and the engaged or disengaged; said cam member includes a pivot axis arranged in the following manner: a second axis in the axis of the first element of the element due to recline the seat back when the seat is applied to the when the load on the seat back frame are mutually offset gap between the first and second elements (C) in an amount corresponding to the formation, between the respective engagement member (12) and the corresponding engaged portion while achieving engagement or detachment. The present invention is applicable to a variety of vehicle seats and other seats.