Patent ID: 8923741

Claim:
A fixing apparatus for fixing a toner image onto a recording material by heating the recording material bearing the toner image at a nip portion while conveying the recording material, the fixing apparatus comprising: a tubular film; a nip portion forming member in contact with an inner surface of the film; a pressure member that forms the nip portion with the nip portion forming member via the film; and a regulation member for regulating a movement of the film, the regulation member includes a first regulation surface facing an inner face of the film to regulate the movement of the film in a radial direction of the film and an second regulation surface facing an end surface of the film to regulate the movement of the film in a generatrix direction of the film, wherein the second regulation surface includes a concave and curved surface area which has a larger amount of curvature as the surface area extends in the radial direction of the film.