To improve yield of a product by molding a raising bar from an upper face of a pedestal part so that a casting tube main part itself is not encroached while a part of the pedestal is encroached at the time when breaking the raising stich off and eliminating a time for remedy and generation of a defective product.

This casting tube is constituted in a way for molding a raising bar 22 from an upper face of a pedestal part to be molded with a pedestal concave part 21a by using an upper die 11 wherein a thick wall pedestal concave part 21a is molded at a portion where the casting mold raising bar 22 is formed, and for breaking off the bar 22 from the upper surface of the pedestal part, after the molding is completed. Thus, encroachment of the casting tube main part itself can be prevented even if a part of the pedestal part is encroached.