Disk cartridge having a dynamically stable supported member in a discrimination hole

摘要

A lid for closing a disk insertion portion of a cartridge body is controlled to be locked/released by inserting/removing a closing member in holes formed in the lid and the cartridge body. The closing member is supported by a plurality of supporting pieces arranged at regular intervals on the inner periphery of one of the holes in the circumferential direction. The closing member can be removed from the holes by being urged in a direction from one of the flat sections of the cartridge body to the other one of the flat sections.