A cylindrical core for manufacturing an endless belt-shaped body includes a cylindrical portion that includes a cylinder whose cylindrical shape is not maintainable without support when an outer surface thereof is orthogonal to the direction of gravitational force; and flange portions that are detachably mounted on both axial ends of the cylindrical portion, wherein the cylindrical core is used in a method for manufacturing an endless belt-shaped body, the method including applying a coating film forming resin solution onto an outer surface or an inner surface of the cylindrical portion in a state in which the flange portions are mounted on the cylindrical portion; drying a solvent of the coating film forming resin solution; and solidifying the coating film forming resin by heating in a state in which the flange portions are removed, to form the endless belt-shaped body.