Patent ID: 7284254

Claim:
A disk cartridge, comprising: a cartridge housing in which a disk compartment is formed by combining an upper shell and a lower shell and in which an opening portion is provided on at least one of said upper shell and said lower shell; and a pair of shutter members provided on said cartridge housing so as to become movable between the opening position at which said opening portion is opened and the closing position at which said opening portion is closed and which has joint portions joined to each other at said closing position, wherein each said joint portion of said pair of shutter members has a central step portion that separates concave and convex portions, which can be engaged with each other, formed over substantially the total length of said joint portion; and wherein each said joint portion includes a guide convex portion located away from the central step portion to enable the concave and convex portions to be engaged with each other at said closing position.