Wood-type hollow golf club head

1. A wood-type hollow golf club head comprising a face having a front surface forming a clubface and a backside facing a hollow, said face having a thickness distribution satisfying the following conditions: (a) tUTP<tUCP>tUHP; (b) tMTP<tMCP>tMHP; (c) tLTP<tLCP>tLHP, wherein tUTP is an average thickness of an upper toe portion UTP, tUCP is an average thickness of an upper central portion UCP, tUHP is an average thickness of an upper heel portion UHP, tMTP is an average thickness of a middle toe portion MTP, tMCP is an average thickness of a middle central portion MCP, tMHP is an average thickness of a middle heel portion MHP, tLTP is an average thickness of a lower toe portion LTP, tLCP is an average thickness of a lower central portion LCP, and tLHP is an average thickness of a lower heel portion LHP, and further (d) tUTP>tMTP<tLTP; and (e) tUHP>tMHP<tLHP; and in the above nine average thicknesses, (f) the largest average thickness is 2.8 to 3.5 mm; and (g) the smallest average thickness is 1.6 to 2.3 mm, wherein said wood-type hollow golf club head further satisfies the following condition: (h) tUCP>tMCP<tLCP.

2. The wood-type hollow golf club head according to claim 1 , which further satisfy the following condition: (i) tUCP>tLCP.

3. The wood-type hollow golf club head according to claim 1 , which further satisfy the following condition: (j) tMTP>tMHP.

4. The wood-type hollow golf club head according to claim 1 , which further satisfy the following conditions: (k) tUTP>tUHP; and (l) tLTP>tLHP.