A bouncer includes a seat, a first connecting member, a support member, and an engaging member. The first connecting member has a first end and a second end. The first end of the first connecting member is connected to the seat. The support member is rotatably connected to the second end of the first connecting member. The engaging member is movably disposed in the support member and capable of moving between a locked position and an unlocked position, so as to selectively restrain the support member from rotating. Accordingly, the bouncer of the invention can be operated in different using states.