Heating apparatus and image forming apparatus

A fixing apparatus comprising:

• a tubular film;
• a heater disposed in an inner space of the film and extending in a longitudinal direction;
• a holding unit disposed in the inner space of the film and configured to hold the heater;
• a press roller configured to form, with the film, a nip portion in which an image on a recording material is fixed by heat from the heater while the recording material is being conveyed;
• a first support member configured to rotatably support a first end of the film in the longitudinal direction;
• and
• a second support member configured to rotatably support a second end of the film in the longitudinal direction,
• wherein either one of the first support member and the second support member is fit to the holding unit.