Patent ID: 7021580

Claim:
A recording tape cartridge which is loaded into a drive device from a predetermined loading direction for use, the recording tape cartridge comprising: a case rotatably accommodating a single reel on which a recording tape is wound, the case having a front wall at a front side thereof in the loading direction and a side wall running along the loading direction, and having a corner portion between the front wall and the side wall, an opening for pulling-out of the recording tape from one end portion of the recording tape being formed at said corner portion; and a shielding member, disposed within the case so as to be slidable along a predetermined locus, for opening and closing the opening by sliding, wherein the predetermined locus is formed by a groove being formed at an interior of the case, and at least one portion of the shielding member is positioned and guided in the groove, wherein the groove has at least two portions having different widths, and a portion of the groove which is at a downstream side in a direction in which the shielding member closes the opening has a groove width which is more narrow than a portion of the groove which is at an upstream side.