An image forming apparatus which forms an image on a sheet, includes a controller which executes a cleaning mode in which the controller conveys the sheet from a sheet feed tray to a fixing device without forming a toner image on the sheet, removes toner that has been adhered to a fixing member to clean. In case the cleaning mode is executed, the controller controls a releasing section to release pressure contact of a pressing member before a leading edge of the sheet in a sheet conveyance direction reaches a nip portion between the fixing member and the pressing member, and to bring the pressing member into pressure contact with the fixing member after the leading edge of the sheet has passed through the nip portion.