PURPOSE: To enable a mass production simply and in a short time by forming a tub of one part in the shape arranged on the same plane as that of a base part and forming a fixed holding belt by bending the tub of the same plane as the base part so as to erect for the base part.

CONSTITUTION: The title belt is formed in the shape that tub 12 and base part 11 are arranged on the same plane and the projecting pieces 16, 16 for locking the base part are erected for the plane. The tubs 12, 12 are then bent so as to erect at the opposite side to the projecting piece 16 for locking the base part 11 for the base part 11 and the projecting piece 16 for locking the base part is formed so a to extend to the side part of the base part 11. The binder holding belt can thus be obtd.