| 摘要 |
PROBLEM TO BE SOLVED: To further extend a sweet area.SOLUTION: A hollow golf club head includes a face part, a crown part, a sole part, and a side part. A multiple groove part, in which a plurality of grooves are disposed outward from a face center part side, is formed in at least either of a toe-side peripheral edge and a heel-side peripheral edge on the backside of the face part. |
