Abstract: A reclining device for use on a vehicle seat in which an intermediate bracket is rotatably supported on an eccentric shaft between a stationary bracket secured to a vehicle seat cushion and a movable bracket secured to a seat back, said stationary bracket and intermediate bracket are operatively connected together by a stepwisely adjustable engaging mechanism operable by an operation lever, a differential reduction gearing mechanism including internal and external gears having the same pitch and differing in tooth number is interposed between said intermediate bracket and said movable bracket and a spiral spring acts between said stationary bracket and said intermediate bracket to urge said movable bracket so that the seat back is urged upwardly forwardly.