| 摘要 |
This invention provides a hollow golf club head in which the ratio of the rigidity of a sole portion to that of a crown portion is 1:0.1 to 0.8. This invention also provides a hollow golf club head in which a crown low-rigidity region is formed on the face side of the crown portion, and a crown high-rigidity region is formed on the back side of the crown portion. The ratio of the rigidity of the crown high-rigidity region to that of the crown low-rigidity region is 1:0.2 to 0.6. Furthermore, this invention provides a hollow golf club head in which a sole high-rigidity region is formed on the face side of the sole portion, and a sole low-rigidity region is formed on the back side of the sole portion. The ratio of the rigidity of the sole high-rigidity region to that of the sole low-rigidity region is 1:0.2 to 0.5.
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