| 摘要 |
In the metal iron golf club head (1), the rigidity of the medium sensitivity region (5) which is a region on the heel side and excluding the vicinity of the face center (3) is made lower than the rigidity of the low sensitivity region (4) so as to approximate the natural frequency of the metal iron golf club head to the natural frequency of the ball as well as to ensure the strength in the face portion (2).
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