Patent ID: 7216826

Claim:
A magnetic tape cartridge comprising: a reel around which a magnetic tape is wound; a cartridge case rotatably accommodating the reel; a reel lock for locking rotation of the reel relative to the cartridge case; a resilient member urging the reel lock toward the reel to lock the reel; a release pad for disengaging the reel lock by displacing the reel lock against an urging force of the resilient member, so as to allow rotation of the reel; and a pivot provided on the reel lock at a position facing with and slidably contacting a contact surface of the release pad in a manner allowing rotation of the release pad, wherein the pivot and the contact surface are both made of resin, and the contact surface is made of a resin having a higher hardness than the pivot, wherein the pivot is made of a resin having Vickers hardness value of 10 to 16, and the contact surface is made of a resin having Vickers hardness value of equal to or greater than 18.