A disc loading device including a disc stocker containing a plurality of the cartridge holders housed and held within the disc stocker in tiers. Each cartridge holder holds a disc cartridge that includes a recording disc housed within a cartridge main member. A chassis is movably supported adjacent the disc stocker. A recording and/or reproducing unit, for recording/reproducing information signals on or from the recording disc, is movably mounted to the chassis. A transport device transports one of the cartridge holders from a first position in the disc stocker in a direction towards the recording and/or reproducing unit to a second position adjacent the recording and/or reproducing unit. The transport device also moves both the cartridge holder and the recording and/or reproducing unit in synchronism in the same direction from the second position to a third position, wherein the transport device moves the recording and/or reproducing unit to a loaded position via a cam such that the disc cartridge held by the cartridge holder is loaded onto the recording and/or reproducing unit for recording/reproduction thereon/therefrom.