OPTICAL DISK CARTRIDGE

PROBLEM TO BE SOLVED: To provide an optical disk cartridge that allows a user to reliably discriminate between an upper surface and a lower surface of a case when the user puts a bare disk into the case so as to make the optical disk cartridge.SOLUTION: An optical disk cartridge 1 that is placed on a tray of a recording and reproducing device by turning a front surface side thereof up so as to be used includes: a case main body 4 for accommodating an optical disk; a storage port 5, through which the optical disk is put into and removed from the case main body 4, disposed on the case main body 4; a through hole 12 disposed on a rear surface side of a case that forms the storage port 5; and a pin shaped member 11 disposed through the through hole 12 in a slidable manner.