Patent ID: 7503853

Claim:
A hollow golf club head having a face portion, a crown portion and a sole portion, wherein said crown portion includes: a crown thin-walled region formed on a face side of said crown portion and beginning from an upper end of said face portion; and a crown thick-walled region formed on a back side of said crown portion, said sole portion comprising a plurality of sole materials, including a first sole material comprising the largest volume of said sole portion, the crown thin-walled material is made of a first crown material, the crown thick-walled material is made of a second crown material, and a Young's modulus of the first crown material is lower than a Young's modulus of the second crown material and a Young's modulus of the first sole material, and wherein said sole portion includes: a sole thick-walled region formed on a face side of said sole portion and made of the first sole material; and a sole thin-walled region formed on a back side of said sole portion and made of another sole material having a Young's modulus which is lower than the Young's modulus of the first sole material.