Cartridge case for a disk-shaped recording medium with particular lid configuration

A cartridge case for a disk-shaped recording medium, comprising:

• a cartridge case body that has a head access window and a drive spindle access window formed on at least one side thereof and that serves to hold the disk-shaped recording medium such that the disk-shaped recording medium can freely rotate therein;
• and
• a shutter that is fitted to the cartridge case body such that it can freely slide along the front edge of the cartridge case body to open and close the head access window and the drive spindle access window,
• wherein the catridge case body has an opening formed in its rear side so that the disk-shaped recording medium can be put into and taken out of the cartridge case body through the opening by being moved in a direction parallel to its recording surface,
• wherein the opening is fitted with a lid that can be put into and taken out of the opening by being moved in the direction in which the disk-shaped recording medium is put into and taken out of the cartridge case body, and
• wherein the lid is provided, in its front edge, with a holding means that admits an outer edge of the disk-shaded recording medium and that holds the disk-shaped recording medium by being brought into contact with both a front surface and back surface of the disk-shaped recording medium as a result of an inclination of said disk-shaped recording medium due to its own weight, and
• wherein the lid is capable of holding the disk-shaped recording medium for insertion into said opening of the cartridge case body.