Patent ID: 6971604

Claim:
A magnetic tape cartridge comprising; a cartridge case composed of a first half and a second half; an opening provided on one side wall of said cartridge case, said opening used for tape drawing; a slide door slidably supported by guide parts disposed on said first half and said second half; respectively, along said one side wall, and said slide door is used for achieving a shutting-and-opening operation of said opening; a spring member for impelling said slide door to a shutting direction side, and an end part in an opening direction side of said spring member serving as a supported part; and a spring supporting part for retaining said supported part, said spring supporting part disposed near said guide part of said first half, wherein said spring supporting part is a slit formed on a rib of said first half, said slit has a slope at the opening direction side thereof, and said slope guides said end part in the opening direction side of said spring member to said slit.