| 摘要 |
In a disk cartridge, a holder engagement portion of a disk holder engages with a holder engagement portion of a cartridge case to determine a positional relationship between the cartridge case and the disk holder when the disk holder is inserted into the cavity, a case interference portion of the case engagement portion and a holder interference portion of the holder engagement portion are prevented from being aligned with each other in the inserting direction and interfering with each other when both positional relationship and attitudinal relationship between the disk holder and the cartridge case are maintained at their respective desirable situations for enabling the disk holder to be inserted into the cavity, and the case interference portion and the holder interference portion are aligned with each other to interfere with each other so that the disk holder is prevented from being inserted into the cavity when the attitudinal relationship between the disk holder and the cartridge case is substantially reversed from the desirable situation thereof as seen in the inserting direction and the positional relationship between the disk holder and the cartridge case is maintained at the desirable situation thereof as seen in the inserting direction.
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