An image forming apparatus includes: an image forming unit; a power supply controller controls the image forming apparatus to operate in a power saving mode in which supply of power to the image forming unit is cut off and a normal mode; and a plurality of interfaces configured to receive a transition command for transition from the power saving mode to the normal mode. The power supply controller performs: an interface-power supply process of supplying power to at least one of the plurality of interfaces; and a changing process of, in a case where a predetermined signal is input to an operating interface receiving power in the interface-power supply unit in the power saving mode, cutting off power supply to the operating interface and starting power supply to at least one of idle interfaces other than the operating interface.