There are provided: an optical pickup feed mechanism (12) that detects a disk signal; a disk loading mechanism (11) that feeds a disk D by means of a loading roller (11b) that is driven by a loading motor (11a); a mechanism control section (20) that controls drive of the loading motor (11a); and an authentication control section (30) that authenticates the authorized user and outputs a disk ejection instruction to the mechanism control section (20) if the registered password and disk ejection instruction are input. The authentication control section (30) is provided with a time setting section (36) that stores a set time length in memory (32), a timer (37) that measures time, and a time decision section (38) that determines lapse of the set time length in accordance with the time length stored in the memory section (32) and the time measured by the timer (37).