A process cartridge having a nonvolatile memory for storing prescribed information corresponding to addresses is detachably attached to a main body of an image forming device. The nonvolatile memory includes a first address at which data including a shipment destination used by a control system of the main body of the image forming device is stored, a second address where data including process control information to further control the control system of the main body is stored, a first unused address at which data including a destination code is stored and which is used by the control system of the main body of the image forming device is not defined, and a second unused address at which no data is stored and of which use by the control system of the main body of the image forming device is not defined.