To prevent local concentration of an eddy current with a simple tooling change and to suppress the width of temperature irregularity to around 10°C in heating a plurality of kinds of metallic cylinder drums different in length by using high-frequency induction heating.

This application is related to a method for heating a metallic cylinder drum by using high-frequency induction heating, and, for more detail, related to a method for heating a tubular support body for an electronic photograph photoreceptor and a tubular electronic photograph photoreceptor, and, for still more detail, a setup method in response to a cylinder length difference in high-frequency induction heating. In the application, a tool formed of the same material as that of the support body and having the same outside diameter as that thereof is attached to a photosensitive drum support body; and the total of the axial length of the tool and the length of the photosensitive drum support body is set equal to the length of a high-frequency current generation effective range of a high-frequency induction coil to prevent temperature irregularity due to local concentration of an eddy current.