The invention is intended to simplify the mechanism of a disk changer. The disk changer comprises a magazine body (4) accommodating a plurality of trays (6) therein, a lock piece (33) for locking the magazine inserted into a changer body, and a tray transferring device (36) for transferring a tray from the magazine thus locked. The tray transferring means (36) serves to unlock the lock piece (33). <IMAGE>
