Disc cartridge having a stopper member that protrudes toward a disc window

A disc cartridge comprising:

• a cartridge body including a disc storage portion, a chucking opening and a head opening, wherein the disc storage portion has a disc window and a bottom and stores a disc, having first and second sides, therein so that the disc is rotatable in the disc storage portion and that the first side of the disc is exposed;
• the chucking opening is formed on the bottom of the disc storage portion so as to get the disc chucked externally;
• and the head opening is also formed on the bottom of the disc storage portion so as to allow a head, which reads and/or writes a signal from/on the second side of the disc, to access the second side of the disc;
• a shutter, which is supported to, and movable with respect to, the cartridge body between the second side of disc and the bottom of the disc storage portion so as to expose or cover the chucking opening and the head opening;
• and
• a stopper member that protrudes toward the disc window to prevent the disc from dropping down through the disc window while the shutter opens.