OPTICAL DISK CARTRIDGE

PURPOSE:To make the dimension of thickness small by holding an optical disk with a case to cover only the information processing face side of the optical disk when the optical disk is not used, releasing the holding at the time of utilization and forming a clearance between an optical disk face and the case. CONSTITUTION:When an optical disk cartridge is used while inserting it into an optical disk device, a shutter 5 is moved, an opening part 6 of a case 1 is opened, an optical disk 8 is detached from hook parts 9 and 10 of the shutter 5 and is opened in the rotary shaft direction of the optical disk 8 and the optical disk 8 can be turned while being separated from the case 1. Here, clearance 11 between the optical disk 8 and the case 1 can be made small. Thus, the thinning of the cartridge is attained.