To provide a method for forming a rugged pattern onto a metallic surface by which a rugged pattern with a subtle difference capable of discriminating others using the same goods can easily be obtained.

A metallic surface is irregularly coated with a masking agent by a spray gun or the like, after that, recessed parts are formed on the parts other than the part coated with the masking agent by an etching means, and the masking agent is removed to form an irregular recessed pattern on the metallic surface.