A recording tape cartridge includes a release member, a sliding protrusion portion, a metallic plate and a reference portion. The release member is provided in a reel hub to be rotatable integrally with the reel. The release member moves a locking member from a locking position to an allowing position when a pushing surface of the release member is pushed from an outer side of a case. The sliding protrusion portion protrudes from the locking member toward the side thereof at which the release member is disposed. The metallic plate is provided in the release member. A distal end of the sliding protrusion portion touches the metallic plate. The reference portion is provided at the release member. The reference portion positions a position of the metallic plate relative to the pushing surface in the axial direction of the reel.