Patent ID: 7780107

Claim:
A recording tape cartridge comprising: a case that has an upper case and a lower case and houses a reel around which recording tape is wound, the upper and lower cases respectively have side walls that define the outer periphery of the upper and lower cases, and the upper and lower cases are joined at the side walls; a regulating wall that is formed on the upper case and on the lower case and defines an area in which the reel is housed, the regulating walls being respectively provided to stand from inner surfaces of the upper and lower cases, the inner surfaces of the upper and lower cases being inside of the side walls, and defined thereby; an attachment member that is held between the regulating wall of the upper case and the regulating wall of the lower case and is disposed on an outer peripheral surface side of the regulating wall; and an RFID that is held on the attachment member along the regulating walls.