ed on the character portion CA. [0133] Next, as shown in FIG. 12C, an oxide film 12 a is formed by performing oxidization processing, such as dipping processing of bichromate, on the master stamper 12 obtained above. [0134] Next, as shown in FIG. 13A, plating processing, etc. with nickel or other material is performed on the obtained mastering master 12 to be a thickness of, for example, 290 ??m o