A disk clamping device for clamping either one of a disk having a small center hole, such as a compact disk, and a disk having a larger center hole, such as a video disk, to a turntable with which the diameter of the turntable can be increased to reduce the amount of bending and vibration of the disk while it is being played. A first hub (24) for centering a disk (30) having a small center hole is mounted on the disk drive shaft (23) of the drive motor (21), while a second hub (26), separate from the first hub (24), is mounted on the other side of the disk playing position together with a clamper (27). The second hub (26) has a clamping surface (26a) which is brought into contact with the surface of the disk having a small diameter hole when engaged with the disk drive shaft (23).