Patent attributes
A head 2 is provided with a face 4, a crown 6, and a sole 8. The head 2 is hollow. At least a part of an inner surface of the head 2 is a metal inner surface Kn. At least one rib 20 made of a metal is provided on the metal inner surface Kn. The at least one rib 20 is a partial weld rib obtained by carrying out partial welding between the rib 20 and the metal inner surface Kn. A welded portion and an unwelded portion coexist in a longitudinal direction of the partial weld rib 20 between the metal inner surface Kn and the partial weld rib 20. Preferably, the partial welding is carried out between a side surface 24 of the partial weld rib 20 and the metal inner surface Kn. Preferably, a weld bead Bd is present on a place on which the partial welding is carried out.
