| 摘要 |
A recording tape cartridge which can prevent positional offset of a case with respect to a cartridge accommodating device. Accompanying operation of loading the cartridge in an arrow A direction into a drive device, a door is moved to a side of opening an opening while an operation projection is engaged by an engagement projection. At this time, a pushing/engaging member of the drive device enters into a cell retention notch, and pushes a push surface and engages with an engagement surface. In this way, at the case, a moment in an arrow E direction around a region of engagement is offset, and the case is prevented from being coming out from the drive device. An inclined surface permits advance and withdrawal of the pushing/engaging member into and from the notch.
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