A disc cartridge provided with: a plurality of trays, each of which can place a disc; and a case where those trays can be taken in and out of an opening, wherein an operating unit is disposed in each of the trays, a guide rail is disposed in either one of the trays and the case in a direction in which the trays are taken in and out of the case, and a fitting unit is disposed in the other of the trays and the case so as to be fit in the guide rail in order to guide the trays along this guide rail, and when the trays are taken in and out of the case, they can be smoothly taken in and out in such a way that the trays are not caught by the case, and a disc recording and/or reproducing apparatus having such a disc cartridge.