A disc cartridge 1 for installing a rotary disc has a write inhibit tab 57 which is provided to be slid and indicates a writable or nonwritable status of the disc by its position. The write inhibit tab is comprised of a main body 58, upper and lower slide portions 65 through 68 formed respectively on upper and lower side ends of the main body, groove shaped intermediate slide portions 69 and 70 formed between the upper and lower slide portions, first projections 63 and 64 formed at distal ends of elastic arms extended from the main body, and second projections 71 and 72 formed on the intermediate slide portions. When the write inhibit tab is used for a disc cartridge of an unremovable disc, the upper and lower slide portions and the first projections are used, and when the write inhibit tab is used for a disc cartridge of a removable disc, the intermediate slide portions and the second projections are used.