| 摘要 |
A magnetic tape cartridge includes an opening 1 C through which a magnetic tape is drawn out, and a slide door 6 that slides along a sidewall 1 D provided with the opening 1 C to open and close the opening 1 C. The opening 1 C is provided in part of the sidewall 1 D across a lower half 1 A and an upper half 1 B of the cartridge case 1 . At least one of a lower half portion and an upper half portion of the sidewall is provided with a holding groove 1 L that receives a front end portion 6 A of the slide door 6 when the opening is closed. Therefore, the upper half 1 B and the lower half 1 A of the magnetic tape cartridge may be smoothly combined.
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