Provided is an image forming apparatus that reduces replacement frequency for waste toner container, and efficiently performs waste toner accommodation with a waste toner container. The image forming apparatus includes a toner detection sensor detecting a quantity of a toner in a toner container; a waste toner detection sensor detecting an accommodation quantity of a waste toner removed from a photosensitive medium and accommodated in a waste toner container; a waste toner container full-state forecasting part that, upon toner detection sensor detecting empty state of toner container, forecasts whether waste toner container is filled up with waste toner before toner container newly loaded is emptied, on detection result by waste toner detection sensor; and a system control part that, upon waste toner container full-state forecasting part forecasting waste toner container being filled up, notifies a replacement message urging replacement of waste toner container to a panel part.