Patent ID: 7322540

Claim:
A recording tape cartridge comprising: an engagement portion formed at a lower wall of a hub of a reel rotatably accommodated within a case around which a recording tape is wound; a brake member facing the engagement portion and provided so as to be movable along an axial direction of the hub, which engages with the engagement portion and controls rotation of the reel, releasing the engagement portion from an engaged state to allow rotation of the reel; a parts mounting portion formed at a central portion of the case and positioned further at an inner side than the hub; a lock member mounted at the parts mounting portion so as to be movable in a radial direction of the reel, which intervenes between the reel and the case and controls movement of the reel in a radial direction and an axial direction, and which is pushed by the brake member to disengage from the reel and allow movement of the reel; and a biasing device that urges the lock member in a radial direction of the reel, wherein the brake member and the lock member respectively have inclines S 1, S 2 with mutually different angles, and the incline S 1 of the brake member and the incline S 2 of the lock member contact each other.