A disc cartridge includes a cartridge body unit having an optical disc (2) rotatably housed in it and provided with a recording and/or reproducing aperture (13) for exposing a part of the disc to outside, and a shutter member (15) slidably carried by the cartridge body member (5). A shutter opening/closing member (63) provided to a disc drive device (50) slides on the shutter member. The shutter member also includes an engagement opening (17a) engaged by the shutter opening/closing member. The shutter member operates for opening/closing the recording and/or reproducing aperture. The shutter member includes a collision buffering part (20) for absorbing the shock of collision against the shutter opening/closing member.