Cartridge in which disk is stored

A cartridge comprising upper and lower half segments butting against each other and containing a disk, the cartridge half segments being provided on one side thereof with a shutter for exposing or alternatively enclosing the disk, a torsion spring being attached to the shutter for biasing the shutter in a closing direction, the cartridge being characterized in that:

• an insertion opening is formed in a side portion of the assembly of the butting half segments for permitting insertion of the torsion spring therethrough from outside,
• a protective wall being provided upright on said side of the half segments between the insertion opening and the disk to define a space by an upper end face of the protective wall and the half segment,
• the space being so sized as to permit the torsion spring to pass therethrough while leaving a small clearance, with legs thereof directed laterally, the space comprising a space H permitting a coil portion to pass therethrough while leaving a small clearance and a space G having a smaller width than the space H for permitting each of the legs to pass therethrough, the space H and the space G being arranged along the direction of opening or closing of the shutter.