To improve the vibration resistance of a disk tray of a disk drive for driving an optical disk, accurately keep the clearance between a turntable for rotating the optical disk and the back of a cover chassis, and exclude factors of a read error and a write error, and improve the reliability. A chassis case 10, a disk tray 1 movable between an loading position in the chassis case 10 and an unloading position outside of the chassis case 10 while supporting a discoid recording medium, pressing means set between the chassis case 10 and disk tray 1 to generate a pressing force for pressing the disk tray 1 in the “direction perpendicular to a recording medium” by using the chassis case 10 as a reaction point when loading the disk tray 1 are included in which the pressing means presses the disk tray 1 in the “direction perpendicular to a recording medium” when the disk tray 1 is located at the loading position.