Patent 9504885 was granted and assigned to Bridgestone on November, 2016 by the United States Patent and Trademark Office.
A golf club head of this invention is a wood type golf club head including a face portion, a crown portion, and a sole portion. A plurality of grooves arrayed in the vertical direction of the face portion are formed in the face portion. The depth of the plurality of grooves is less than 0.025 mm. When pitches between, out of the plurality of grooves, grooves adjacent in the vertical direction of the face portion are represented by P1, P2, . . . , Pn sequentially from the upper side to the lower side of the face portion, P1≧P2≧ . . . ≧Pn, and P1>Pn.