A simplified disc-clamping mechanism is provided to decrease the number of parts and processes of the assembly of a disc-clamping mechanism. The disc-clamping mechanism has a clamping plate sandwiching a disc by cooperating with a turntable, and a clamp base rotatably holding the clamping plate. The clamping plate has a surface plate pressing a disc toward the turntable, a small-radius body portion having an outer diameter smaller than that of the surface plate portion, and a flange portion protruding more than an end portion in an axial direction of the small-radius body portion and being parallel to the surface plate portion. The clamp base is integrally formed while including a thin-plate shaped holding portion, a stopper piece, and a bent portion which extends from the holding portion.