| 摘要 |
A recording tape cartridge with high strength and resistance to deformation around an opening aperture of a case, which opening aperture is for drawing out recording tape. The recording tape cartridge is provided with a leader block at a distal end of a magnetic tape. Left and right peripheral portions of this leader block are defined by wall portions. The leader block is mounted and removed at a leader block-retaining portion, which is an opening portion which penetrates through the case vertically. An opening aperture for drawing out the magnetic tape from the case is formed at a base portion of the leader block-retaining portion. Because the wall portions are provided, the leader block-retaining portion does not have free-standing end portions at any of a front wall at a front wall side thereof, a ceiling plate and a floor plate, and strength of the leader block-retaining portion is high.
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