<p>[PROBLEMS] To provide a disk recording/reproducing device with higher convenience compared to a conventional case by making the device thinner than ever and by enabling to use it in various states in the disk recording/reproducing device where a tray and a lid are opened/closed by one motor by time difference. [MEANS FOR SOLVING PROBLEMS] A space required for driving can be made small by performing rotation driving of a rotary tray and opening/closing driving of the tray storing lid by a special mechanism. Rotation driving and opening/closing driving can be performed by one motor with time difference synchronization by a mutual operation of a main cam gear, a tray tooth-missing gear and a tray storing lid tooth -missing gear, which have special shapes. Thus, the number of components is reduced and space can be saved. Nonconformity that a substandard disk is installed can previously be detected even if it is used in various states by functions of a maldistribution-side sensor and a non-maldistribution-side sensor.</p>
