| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve repulsiveness without damaging durability. SOLUTION: The golf club head 1 has a face portion 2 to strike a ball with, and is hollow in the interior. The face portion 2 has a first annular thin-wall portion 9a surrounding the central area Ac of the face and thinner than the central area Ac of the face and a second annular thin-wall portion 9b on the back 7 of a face surface F. A first protrusion 10a thicker than the first annular thin-wall portion 9a is provided between the first annular thin-wall portion 9a and the second annular thin-wall portion 9b.</p> |
