A disc player is disclosed which includes a casing having a disc inserting opening, a turntable driven by a spindle motor, a clamper arm operating means for operating a clamper arm in cooperation with said turntable, a centering mechanism for guiding a disc from the disc inserting opening onto the turntable, the centering mechanism including a pair of centering arms (13, 14) each having at distal end portions contact portions which are to be brought into contact with a circumferential edge of the disc, the centering arms being pivotally movable at a predetermined distance in the disc inserting opening, a detecting lever (42) for detecting a condition that the disc is laid on the turntable, and a disc double insertion preventing lock linkage (43, 57) for preventing another disc from being inserted into the casing through the disc inserting opening when the first-mentioned disc is already located on the turntable, the double insertion preventing lock linkage being in cooperation with the centering mechanism.