A disk clamping device includes clamp pawls 3, which project from or retract into through holes 22 formed in a turntable 2 to be rotated and driven by a disk rotating-and-driving motor 1; a rotating-and-elevating member 3, disposed rotatably and in an ascendable and descendable manner in synchronism with the turntable 2, when going up, causing the clamping pawls 3 to project from the through holes 22, and when going down, causing the clamping pawls 3 to retract into the through holes 22; and clamp releasing levers 6, 7 pushing down the rotating-and-elevating member 3 against a pushing-up and urging force, wherein the turntable 2 has pawl-receiving part protrusions 24 forming clamp pawl receiving parts, which are protruded on the underside of the turntable and communicate with the through holes 22; and the rotating-and-elevating member 4 has protrusion receiving holes 42 formed thereon into which the pawl-receiving part protrusions 24 are fitted at the time of upward movement of the rotating-and-elevating member 4.