A disk-clamping device includes a plurality of clamp pawls which project and pull in through a plurality of windows 6c formed on a turntable; a rotating and elevating member which, when it goes up, causes the clamp pawls to project and rotate through the windows, and, when it goes down, causes the clamp pawls to pull in into the windows; an urging member which pushes up and urges the rotating and elevating member; and clamp-releasing levers which move the rotating and elevating member in a direction of pushing down the member and in a direction of releasing the push down against an urging force; and the clamp-releasing levers being arranged to be driven by power of a driving source moving the mounting system of the turntable to a reproducing position and a retracted position.