Patent ID: 7055772

Claim:
A recording tape cartridge comprising: a case which is substantially rectangular, and at which an upper case and a lower case are joined together with peripheral walls thereof abutting one another, and which rotatably accommodates a single reel on which a recording tape is wound, the peripheral walls respectively intersecting a top face of the upper case at an upper edge and a bottom face of the lower case at a lower edge; and an opening formed at a corner portion of the case at a side of loading the case into a drive device, the opening being for pulling out of a leader member attached to an end portion of the recording tape, wherein concave portions extending over the upper case and the lower case are formed at a peripheral wall of the case, said peripheral wall faces in a forward loading direction which the cartridge moves when loaded into the drive device, such that the concave portions do not extend to the upper edge and the lower edge.