Metallic plate and recording tape cartridge

A recording tape cartridge comprising:

• a reel at which a recording tape is wound onto a reel hub whose shape is a circular tube with a bottom portion, the reel being rotatably accommodated in a case;
• a locking member that is provided in the reel hub to be movable in an axial direction of the reel, the locking member movable to a locking position, at which the locking member locks rotation of the reel, and an allowing position, at which the locking member allows rotation of the reel relative to the case;
• a release member that is provided in the reel hub to be integrally rotatable with the reel, the release member moving the locking member from the locking position to the allowing position in the event that the release member is pushed from an outer side of the case;
• a sliding protrusion portion that protrudes from the locking member toward the side thereof at which the release member is disposed;
• and
• a metallic plate being a structure of the release member, wherein:
• the metallic plate comprises:
• a sunken portion formed at a central region of a surface of the metallic plate, the surface being substantially orthogonal to a plate thickness direction of the metallic plate;
• and
• a touching surface formed at the sunken portion, and being to be touched by a distal end of the sliding protrusion portion;
• wherein, if a plurality of the metallic plate are stacked in the plate thickness direction in a state in which the metallic plates are not attached to release members, the touching surface of each metallic plate is not in contact with any other of the metallic plates.