A disk unit wherein a disk inserted by a plurality of arms, the arms being able to convey the disk while supporting an outer periphery edge of the disk, is loaded to the interior of the disk unit or the disk accommodated in the interior of the disk unit is unloaded to the exterior of the disk unit, wherein a turntable for rotating the disk in a fixed state of the disk thereto is provided on a vertically movable lift frame and when the disk is inserted from a disk inlet in an initial descended state of the lift frame, a rear end portion of the disk is lifted and conducted to a holder of a disk supporting arm.