In a disc cartridge for an optical disc and the like, to increase stiffness in an opening for a record and reproduction mechanism. A disc cartridge 10 has an upper shell 12, a center frame 14, and a lower shell 16 clamped to one another. A center frame opening 20 and a lower shell opening 22 expose a recording surface of a recording medium contained between the center frame 14 and the upper shell 12 downwardly, and a reinforcing member 24 integrally couples the ends of the center frame opening 20, and a lower shell reinforcing member 26 integrally couples the ends of the lower shell opening 22.