Abstract: A holder device used in a disc recording and/or reproducing apparatus employing a disc cartridge includes a holder, a chassis and a supporting mechanism. The holder holds a disc cartridge and is rotatably mounted on the chassis. The supporting mechanism rotatably supports the holder relative to the chassis. The supporting mechanism includes a pair of shafts provided on one of the chassis and the holder and a pair of receiving portions having engagement holes engaged by the shafts. One of the receiving portions has a cut-out continuing with the engagement hole. The supporting mechanism is designed so that, after the other shaft of the pair of shafts is engaged in the other engagement hole of the pair of engagement holes, one shaft of the pair of shafts is engaged in one engagement hole of the pair of engagement holes via the cut-out for rotatably mounting the holder on the chassis.