An image forming apparatus comprising a main body having a copy function of printing an image read from a document on a paper sheet, a printer function of printing an externally input image on a paper sheet, and a paper ejection port to eject a printed paper sheet. The apparatus also includes a paper ejection unit which has a first tray and a second tray for receiving a paper sheet ejected from the paper ejection port, and moves the trays selectively to the positions corresponding to the paper ejection port. The apparatus also includes a control panel for setting an operating condition of the apparatus, and a state key provided on the control panel and configured to operate when holding the trays at current positions.