A recess (16a3) is provided to be continuous with the circumferential edge of a tray recess (16a2) of a disk tray (16) housing an optical disc (28) to allow a pickup (45) to move without contacting anything. A cover section (17c) having a substantially tongue-like shape adapted to the recess (16a3) is projected integrally from a rotor support member (17) covering the tray recess (16a2) from above and defining a substantially cylindrical housing space (18) for coaxially housing the optical disc (28), the cover section continuously covering the recess (16a3) of the disk tray (16) and the housing space (18). Even when the optical disc (28) is rotated at a high speed, flutter attributable to airflow or a difference between pressures on both sides of the optical disc (28) can be reduced to allow the optical disc (28) to rotate with stability.