An apparatus is provided to easily prevent walking of a belt while avoiding twisting, warping and buckling of the belt including using an inexpensive endless belt with low rigidity in a fixation apparatus of so-called belt nip method. The apparatus includes a heating roll, an endless belt that presses against the heating roll and rotates along with the heating roll, and a pressing member that presses the endless belt against the heating roll 1 and forms a contact nip region between the endless belt and the heating roll. A belt walk guide that limits walking of the edge of the endless belt is provided on at least one side of the contact nip region between the between the heating roll and the endless belt. The belt walk guide is positioned on an axis parallel to an axis of the heating roll and passing through the contact nip region. The apparatus also includes a pressure roll and the endless belt.