| 摘要 |
The golf club shaft according to the present invention is provided with a pseudo-cylindrical concave polyhedral shell structure composed of triangles or trapezoids on the entire outer circumferential surface or on a part of the outer circumferential surface. With this structure of the golf club shaft, the degradation in the mechanical strength and the increase in the material cost are prevented. At the same time, a lighter weight golf club shaft can be produced while a greater degree of freedom is allowed in designing the characteristics such as bending stiffness distribution, a kick point position, bend point, etc. upon designing the golf club shaft.
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