A plurality of process cartridges are provided at a device main body. The process cartridges are arranged in tandem in a vertical direction, and are each mountable/removable by being withdrawn in a horizontal direction. A transport belt is disposed near side portions of the process cartridges. The transport belt transports paper between the transport belt and each of the process cartridges. A cover covers the side portions of the process cartridges and is axially supported at the device main body, below the process cartridges, to be swingable. The cover is attached to be capable of opening and closing a process cartridge side portions side of the device main body. The belt is mounted at the cover so as to be disposed between the process cartridges and the cover, and operates integrally with the cover.