Patent ID: 7588504

Claim:
A hollow golf club head having a sole portion, a crown portion and a side portion, wherein a ratio of a rigidity of said sole portion to that of said crown portion is 1:0.1 to 0.8, a crown low-rigidity region is formed on a face side of said crown portion, a crown high-rigidity region is formed on a back side of said crown portion, and a ratio of a rigidity of said crown high-rigidity region to that of said crown low-rigidity region is 1:0.2 to 0.6, and wherein the crown low rigidity region extends from the face side end of the crown portion at a substantially constant rigidity at least 20 mm toward the back side of said crown portion, and wherein said sole portion includes a sole high-rigidity region formed on a face side and a sole low-rigidity region formed on a back side, and wherein a thickness of said side portion is the same as a thickness of said crown low-rigidity region.