Patent ID: 7356827

Claim:
A disc cartridge comprising a disc; and a main cartridge body unit having said disc rotatably housed therein; one lateral surface of said main cartridge body unit being a substantially semicircular arcuate section having a center of said disc housed in said main cartridge body unit as a center thereof, wherein a back side of said main cartridge body unit opposite said arcuate section is a curved section having a curvature smaller than a curvature of said arcuate section wherein an engagement recess engaged by a part of an ejection unit provided to a recording and/or reproducing apparatus loaded with the disc cartridge is formed in the lateral side of the main cartridge body unit carrying said arcuate section, and wherein a cut-out portion opened in an opposite direction to an inserting direction is formed on a side of said engagement recess opposite to the inserting direction into the recording and/or reproducing apparatus.