Disk cartridge

A disk cartridge comprising:

• a pair of case halves each formed with a driving shaft insertion hole and a plurality of pickup insertion holes,
• an annular disk holder mounted on an inner wall of each of said case halves at a periphery of said driving shaft insertion hole, said disk holder including a cylindrical wall and a flange extending radially from one end of the cylindrical wall, and said cylindrical wall being provided with a cutout formed at the other end thereof and a projection protruding radially outward adjacent to the cutout,
• a rotary shutter formed with a plurality of window holes provided at positions corresponding to said plurality of pickup insertion holes and rotatably supported by said cylindrical wall,
• a turning shutter rotatably supported by a pivotal shaft provided in each of the case halves at a position separate from a center of said rotary shutter to open and close said driving shaft insertion hole, said turning shutter being coupled with said rotary shutter interlockably,
• a slider which slides along an outer peripheral end portion of each of the case halves and is coupled to said rotary shutter, and
• a disk rotatably contained within said pair of case halves being joined together at their inner sides.