Patent ID: 7559500

Claim:
A recording tape cartridge comprising: a case that rotatably houses a single reel onto which is wound recording tape having a leader pin attached to an end portion thereof, which case includes a side wall at which is formed an opening for allowing the leader pin to be pulled out; and holding portions that are formed at a top plate and a bottom plate of the case and which hold the leader pin in the vicinity of the opening, wherein: the leader pin includes, at both ends of a body portion, large diameter portions having an outer diameter that is larger than the outer diameter of the body portion and flange portions disposed at the large diameter portions via neck portions having an outer diameter that is smaller than the outer diameter of the large diameter portions; the holding portions include slit portions that open towards the opening and into which the neck portions are capable of entering, first concave portions that are formed at inner surface sides of the slit portions and which are configured to house the large diameter portions, and second concave portions that are formed at outer surface sides of the slit portions and which are configured to house the flange portions; and the flange portions are formed so as to have an outer diameter that is smaller than the outer diameter of the large diameter portions, so that the leader pin is configured to be housed in the holding portions when the leader pin is returned to the holding portions in a state in which the leader pin is slanted at a predetermined angle with respect to a take-up direction of the recording tape.