Recording tape cartridge
A recording tape cartridge (10) can prevent release of rotation locking of a reel (40) with respect to a case accompanying dropping of the recording tape cartridge. The tape recording cartridge is configured to rotatably accommodate within a case a reel that has magnetic tape wound on a reel hub. Within the reel hub, external teeth of a brake gear (82), of a brake member (80) that is supported so as to be non-rotatable with respect to the case, mesh with an engaged gear (54) having internal teeth, preventing rotation of the reel with respect to the case. Lock portions (93) of lock members (90) are inserted between the reel positioned biased to a bottom panel side by a compression coil spring (78), and a top panel, thereby preventing movement of the reel with respect to the case in the reel axial direction.