Patent ID: 7159814

Claim:
A magnetic tape cartridge comprising; a cartridge case composed of one half and another half; an opening provided on one side wall of said cartridge case, and is used for tape drawing; a slide door slidably supported by guide parts disposed on said one half and said another 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 has a supported part; and a spring supporting part, on said one half, for retaining said supported part, and is disposed near said guide part of said one half; whereby when said one half is assembled with said another half, onto which said slide door and said spring member are placed, said spring member is retained by said spring supporting part through said supported part, and impels said slide door to the shutting direction side, wherein at least a portion of a free end of said spring supporting part is provided with a sloped surface facing towards the shutting direction side.