| 摘要 |
A recording tape cartridge is formed from a substantially rectangular case. The case is formed from an upper case, at which a first peripheral wall stands erect at a ceiling plate, and a lower case, at which a second peripheral wall stands erect at a floor plate. The case rotatably accommodates a reel on which a recording tape is wound. At least one screw boss, which is for joining the upper case and the lower case together, is disposed at a position of the upper case and the lower case. The screw boss has a structure in which a convex portion and a concave portion are fit together. A thickness of a border between the first peripheral wall and the ceiling plate and a border between the first peripheral wall and the floor plate is formed to be thinner than a thickness of the second peripheral wall.
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