Recording tape cartridge

[0029]Herebelow, the exemplary embodiment of the present invention will be described in detail on the basis of the example illustrated in the drawings. Herein, for convenience of explanation, a loading direction of a recording tape cartridge 10 into a drive device is shown as arrow A, and is a forward direction (front side) of the recording tape cartridge 10. The direction of an arrow B that is orthogonal to arrow A is a rightward direction (right side). Further, a direction that is orthogonal to the direction of arrow A and the direction of arrow B is shown as arrow C, and is an upward direction (upper side) of the recording tape cartridge 10.

[0030]Firstly, a first exemplary embodiment will be described. As shown in FIG. 1 to FIG. 3, the recording tape cartridge 10 includes a substantially rectangular box-form case 12. An upper case 14 and a lower case 16 are made of a resin such as polycarbonate (PC) or the like. A peripheral wall 14B stands erect from the peripheral edge of a ceilin