A fixing apparatus has a belt-shaped rotary member, a pressure member urged against the rotary member to form a nip portion, and a heater for the rotary member. A portion of the rotary member is maintained so that the belt portion has a radius of curvature smaller than an inner diameter of the rotary member, and after the apparatus is stopped a predetermined time, when the rotary member is rotated again, a control sequence is carried out in which the portion of the rotary member including the smaller radius of curvature is conveyed and positioned in the nip portion and the heating is performed while rotation of the rotary member is stopped, or, after the apparatus is stopped more than a predetermined time, when the rotary member is rotated again, a control sequence is carried out while conveying the portion of the rotary member including the smaller radius of curvature through the nip portion once at a speed smaller than a normal conveying speed.