Patent ID: 7935002

Claim:
A golf club shaft comprising a UD torsional rigidity holding layer made of thermosetting resin including reinforcing fibers diagonally crossed in the longitudinal direction of said shaft, a UD flexural rigidity holding layer made of thermosetting resin including reinforcing fibers aligned in parallel to the longitudinal direction of said shaft, and a UD compressive rigidity holding layer which is reinforced with reinforcing fibers in the direction vertical to the longitudinal direction of said shaft, characterized in that a plain weave fabric layer is obtained by winding and curing like a shaft-shape a plain weave prepreg which lets a plain weave fabric having mutually woven warps and wefts impregnate with thermosetting resin in such a way that said warps and wefts are diagonally crossed in the longitudinal direction of said shaft, a triaxial fabric layer formed by winding like a shaft-shape a triaxial fabric prepreg is obtained by impregnating a triaxial fabric which has first warps inclined to wefts and second warps diagonally crossing with the first warps and has a structure where these warps and wefts are woven by alternately passing through upsides and downsides of yarns with thermosetting resin in such a way that said wefts become parallel with or vertical to the longitudinal direction of said shaft and curing the prepreg, and at lest a part of said UD flexural rigidity holding layer is between said triaxial fabric layer and said plain weave fabric layer.