An image forming apparatus includes the following elements. An apparatus body implements plural functions including an image reading function, an image forming function, and a display function. A controller controls first, second, and third power states. A first operation unit outputs a transition signal for shifting the states of the image reading function and the image forming function to the second power state. A second operation unit outputs a copy start signal for starting an operation to copy a document. A copy controller controls, when the functions other than the display function are in the third power state, the operation to copy a document in accordance with a copy start signal, and performs control so that another copy start signal is not handled during a period from when controlling of the operation to copy a document has started until when a predetermined specific state is detected.