The present invention provides a heat developing method and a heat developing apparatus for stabilizing density and making image quality stable when executing a heat developing process by a rapid process of 10 seconds or less. The heat developing method is a method for heating a film with a heat developing photosensitive material coated on one side of a support base thereof for a heating time of 10 seconds or less and then cooling it, which opens the face side of the film with the heat developing photosensitive material coated, heats it from the support base side, and cools it from the supports base side by opening the side of the film where the heat developing photosensitive material is coated.