the present invention relates to a control rod installed in a boiling water reactor , and particularly to a control rod using metal . an object of the present invention is to provide a manufacturing method of a control rod for a boiling water reactor , having excellent corrosion resistance in high temperature water and excellent wear resistance at the time of fabrication , and in which the influence of the manufacturing process is slight . in order to achieve the above described object , the present invention provides a manufacturing method of a control rod for a boiling water reactor constructed with sheaths having a u - shaped cross section attached to each end of a tie rod having a cruciform cross section , and rod , plate or oval tube cross section metal hafnium type neutron absorber material contained inside the sheaths , in which an anodized film is provided on a surface of the neutron absorber material as a pre - process of assembly of the neutron absorber material in the structure of the control rod .