An image forming apparatus is described. Selecting a function desired by a user from among functions provided in the apparatus is provided to improve operability as well as eliminating erroneous copy. In the image forming apparatus, an operation unit includes a display panel for displaying a function selecting portion. An operation unit side control portion, as the function selecting portion, has a first function selecting portion in which selectable function items are displayed corresponding to an operation mode and a second function selecting portion in which other function items which are selectable at the same time. The first function selecting portion and the second function selecting portion are displayed at the same time on the display panel, so that functions of the first function selecting portion and functions of the second function selecting portion are selectable at the same time.