Patent ID: 7510485

Claim:
A golf club head comprising a main body and a crown cover disposed in a crown portion of the head, said main body comprising a crown base made of a metal material and provided with a plurality of openings, said openings gradually decreasing in the opening area from the backside to the foreside of the head, and said crown cover made of a material whose specific gravity is lower than said metal material, and disposed on the crown base so as to cover said openings, wherein said openings are a single first opening formed in the rear of the crown base, and a plurality of second openings smaller than the first opening and formed on the front side of the first opening, the second openings each have an area of from 0.5 to 2.0 sq.cm, the number of the second openings is in a range of from 10 to 20, the first opening has an area of from 20 to 30 sq.cm, and the centroid of the first opening is positioned on the backside of a position which is at a distance of 66% of the depth (CL) of the crown portion backwardly from the front end of the crown portion.