A heating apparatus includes a cylindrical film and a pressing element that rotates with the cylindrical film and forms a nip with the cylindrical film. A medium is conveyed through the nip from an upstream side to a downstream side. The apparatus further includes a guide member arranged inside the cylindrical film and contacting the cylindrical film, and a substrate arranged inside the cylindrical film and on which a heating element is disposed. A downstream end of the substrate is located downstream of a downstream end of the nip.