An image-forming apparatus includes: a main casing; a drawer movable in a first direction between a first position inside the main casing and a second position outside the main casing; process cartridges attachable to and detachable from the drawer; a controller; and a device-side terminal connected to the controller. The process cartridges are arranged in the first direction in an attached state to the drawer. Each process cartridge includes a photosensitive drum, a magnetic roller, a developing container for storing carrier, a conveying member, a toner sensor, a process memory, and a process-side terminal. The toner sensor is configured to output a detection signal corresponding to a concentration of toner in the developing container. The process-side terminal is for both outputting the detection signal of the toner sensor and outputting information about the process cartridge stored in the process memory. The device-side terminal is configured to contact the process-side terminal.