An image forming apparatus has a fixing unit for heat fixing an unfixed image formed on a recording material at a nip, with the fixing unit having a rotary fixing member disposed for contacting with the recording material; a heating member for externally heating the rotary fixing member; and a control for stopping revolution of the rotary fixing member in association with a door opening in the image forming apparatus, wherein the heating unit is controlled in association with the door opening state and the contact state of the heating member and fixing member.