In an image heating apparatus having an endless belt for heating an image T on a recording material P in a nip portion N, nip forming means for forming the nip portion N between itself and the belt, and regulating means for regulating the bias of the belt in the width direction thereof, even when in the rotation shape of the endless belt, there is a portion changing greatly in curvature, the damaging of the end portion of the endless belt resulting from the long-period use of the endless belt is prevented to thereby improve the durability of the belt. The regulating means is characterized by a flat plate-shaped rotary member provided at a predetermined distance from the belt and capable of being driven to rotate by contacting with the end surface of the belt with the bias of the belt.