A golf club head having a hollow structure comprising a head main body provided with a top opening and a crown plate fitted in the top opening is disclosed. The head main body is provided with a support for the crown plate extending along the edge of the top opening and protruding into the top opening with a variable width from the edge of the top opening. the average Wa of the width of the crown plate support existing in the foreside one-quarter zone of the top opening, the average Wc of the width of the crown plate support existing in the backside one-quarter zone of the top opening, and the average Wb of the width of the crown plate support existing in the mid two-quarter zone of the top opening satisfy (1) Wa>Wb, and (2) Wc>Wb.
1. A golf club head having a hollow structure comprising:
a head main body provided with a top opening in a crown portion and
a crown plate fitted in the top opening so as to close the top opening, wherein
the head main body is provided with a crown plate support, the crown plate support extending along an edge of the top opening and protruding into the top opening with a variable width from the edge of the top opening so as to support a peripheral part of an inner surface of the crown plate, wherein
an average Wa of a width of the crown plate support existing in a foreside one-quarter zone of the top opening, an average Wc of a width of the crown plate support existing in a backside one-quarter zone of the top opening, and an average Wb of a width of the crown plate support existing in a mid two-quarter zone of the top opening satisfy the following conditional expressions (1) and (2):
Wa>Wb (1)
Wc>Wb. (2)
2. The golf club head according to claim 1 , wherein
the ratio Wa/Wb is from 1.1 to 2.0, and
a ratio Wc/Wb is from 1.1 to 2.0.
3. The golf club head according to claim 2 , wherein
the following conditional expression (3) is further satisfied:
Wa>Wc. (3)
4. The golf club head according to claim 2 , wherein
a ratio Wa/Wc is from 1.1 to 3.0.
5. The golf club head according to claim 1 , wherein
the following conditional expression (3) is further satisfied:
Wa>Wc. (3)
6. The golf club head according to claim 1 , wherein
a ratio Wa/Wc is from 1.1 to 3.0.
7. The golf club head according to claim 1 , wherein
in a plan view of the head, a center of gravity of the head is positioned within said mid two-quater zone of the tope opening.