To provide a disk device, which can reliably lead and house a disk into a disk housing section requiring only a small space.The disk device is provided with: a pick arm 130 which swings and inserts a drive unit for playing a disk D into a space created by splitting a plurality of trays 250; and a loading arm 256 which can move between a leading position for abutting on the disk D inserted/ejected with respect to the tray 250 and leading the disk D, and a withdrawing position for withdrawing from the disk to be played. A pick swing cam plate 138, which controls the drive of the pick arm 130 and the loading arm 256, is provided so as to be slidingly moved by a drive mechanism.