| 摘要 |
In order to prevent that the opening is opened inadvertently, a disc cartridge having a shutter portion which can open and close an opening for access to a disc-shaped disc medium, which opening is formed in at least one surface of a case which rotatably accommodates the disc medium, wherein two groove portions are provided at wall surfaces of the case, and an operating portion of a lock mechanism for the shutter potion is provided in one of the groove portions, and an activating portion for opening and closing operation of the shutter portion is provided in another of the groove portions, is provided.
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