Fixing device and image forming apparatus

A fixing device comprising:

• a fixing belt that is endless and configured to rotate;
• a heating roller configured to abut an inner peripheral surface of the fixing belt and apply heat to the fixing belt;
• a steering roller configured to abut the inner peripheral surface of the fixing belt together with the heating roller;
• a pressurization rotating member configured to pressurize the fixing belt, wherein the pressurization rotating member and the fixing belt form a fixing nip portion and, in a case where a toner bearing recording material bearing unfixed toner is nipped and conveyed to the fixing nip portion, an unfixed toner image is fixed to the toner bearing recording material;
• a belt position detection unit configured to detect a position of the fixing belt in a width direction of the fixing belt;
• and
• a control unit configured to control, based on a detection result of the belt position detection unit, the steering roller to swing to move the fixing belt to a prescribed position in the width direction,
• wherein, in a case where a first recording material having a length greater than or equal to a predetermined length in a conveying direction of the first recording material is conveyed to the fixing nip portion, a maximum inclination angle of the steering roller is smaller than the maximum inclination angle of the steering roller in a case where a second recording material having a length less than the predetermined length in the conveying direction is conveyed to the fixing nip portion.