To provide a manufacturing method for a seamless belt for electronic photograph which does not have transfer unevenness, has a high running stability, does not produce images with natural rolling peculiarity, and has a high durability.

This manufacturing method for the seamless belt for electronic photograph includes eight processes (1) the molding process of a preform, (2) the heating process, (3) the draw-blowing process, (4) the inserting process, (5) the pressurizing process, (6) the heating process, (7) the cooling process and (8) the seamless belt forming process. In this case, in the molding process (1), a thermoplastic resin mixture is injected, and the preform is molded. In the heating process (2), the preform is heated to Tg or higher of the thermoplastic resin in the thermoplastic resin mixture. In the draw-blowing process (3), the preform is blown into a cylindrical die (c) at lower than Tg of the thermoplastic resin, and a bottle-like molded article (d) is molded. In the inserting process (4), the bottle-like molded article (d) which has been blow-molded is inserted in a cylindrical die (e) at lower than Tg of the thermoplastic resin. In the pressurizing process (5), the inserted bottle-like molded article (d) is pressurized to the atmospheric pressure or higher. In the heating process (6), the cylindrical die (e) is heated to Tg or higher of the thermoplastic resin. In the cooling process (7), the cylindrical die (e) is cooled to Tg or lower of the thermoplastic resin. In the seamless belt forming process (8), the bottle-like molded article (d) is taken out from the cylindrical die (e), is cut, and is formed into the seamless belt shape.