To provide an image heating device capable of achieving an excellent image without causing slipping through the life endurance by preventing a sliding layer formed on a sliding surface between a heater and a fixing film from increasing in torque due to the scraping or peeling off from a substrate according to endurance.

The particle diameter of a filler contained in a sliding layer on a heater surface has a distribution in the thickness direction of the sliding layer, and the particle diameter becomes larger as closer to the substrate and becomes smaller as closer to the surface.