A photosensitive recording medium cartridge comprising a cartridge body, an opening, and a shutter, the cartridge body receiving a disc type photosensitive recording medium therein so that the photosensitive recording medium can rotate, the opening being provided in the cartridge body for exposing the photosensitive recording medium to an outside, the shutter being attached to the cartridge body so that the shutter can move between a close position for closing the opening and an open position for opening the opening, wherein: the shutter includes a bent portion which is formed in an outer circumferential end portion of the shutter so as to be bent toward the cartridge body side; and the cartridge body includes a protrusion portion which is formed in a position corresponding to the outer circumferential end portion.