An image forming apparatus having an operation mode, an energy saving mode, and a stop mode includes an image forming unit that forms an image on a recording member, and a control unit that controls the image forming unit, wherein the control unit includes an arithmetic unit that performs a logical operation or a numerical operation, a storage unit that stores a register value used by the arithmetic unit in a non-volatile register which is readable and writable, and retains stored information even when no power is supplied, and a change unit that changes the register value stored in the non-volatile register so as to correspond to a mode change between the operation mode and the energy saving mode or between the operation mode and the stop mode.