Patent ID: 8911303

Claim:
A method for manufacturing a golf club head which is manufactured by hot forging of low-carbon steel and in which a cavity is formed on the rear side of the face, the method comprising the steps of: forming a plurality of portions of irregularity by press processing during the hot forging in order to form the hitting surface for hitting a ball on the face; and flattening the forged surface of the portions of irregularity after forming the portions of irregularity so as to fine crystal grains in the portions of irregularity and the areas therearound and to form fiber flows thereby increasing strength and hardness of the hitting surface, wherein the portions of irregularity have configuration, as viewed from the front side of the hitting surface, selected from plurality of circular shapes, linear band shapes and waved band shapes and each projecting portion of the portions of irregularity has a cross-sectional shape of a mountain-like triangle or a trapezoid.