Abstract: A disk unit includes a loading portion that accommodates a recording medium, a main body unit that contains the loading portion, a cover rotatably attached to the main body unit and capable of moving between a closed position that covers the loading portion and a plurality of open positions that exposes the loading portion, a retaining member provided on the main body unit for retaining the cover in the closed position, a member for manually moving the retaining member to a release position at which the cover is released from retention in the closed position, a drive member activated in response to an eject signal, and a drive transmission mechanism that transmits a drive force of the drive member to the retaining member so as to move the retaining member to the release position.