The object of the invention is to provide a magnetic tape cartridge, in
which a release pad can be assembled securely by a robot. A magnetic tape
cartridge including: a reel around which a magnetic tape is wound; a
cartridge case which houses the reel in a locked position; a release pad
for releasing locking of the reel; and a cup-like hub of the reel in
which the release pad is mounted, wherein a plurality of guide holes for
allowing a plurality of lock release pins to penetrate therein, which
extend from the lower surface of the release pad, are made in the
periphery of a base plate of the cup-like hub, and a plurality of pairs
of guide ribs, which are capable of guiding the plurality of lock release
pins to the plurality of guide holes, stand inside the cup-like hub
corresponding to the plurality of guide holes.
