Patent ID: 7172518

Claim:
A golf club shaft comprising a torsional rigidity holding layer made of thermosetting resin including reinforcing fibers diagonally crossed in a longitudinal direction of said shaft and a UD flexural rigidity holding layer made of thermosetting resin including reinforcing fibers aligned in parallel to the longitudinal direction of said shaft, characterized in that said torsional rigidity holding layer includes a plain weave fabric layer obtained by winding and curing like a shaft-shape a plain weave prepare which lets a plain weave fabric having mutually woven warps and wefts of carbon fibers impregnate with thermosetting resin in such a way that said warps and wefts are diagonally crossed in the longitudinal direction of an entire length of said shaft, and a thickness of said warps and wefts of said plain weave prepreg is 3 K or less; and a UD torsional rigidity holding layer formed by winding and curing a UD prepreg sheet having reinforcing fibers cross in a bias mode each other by superposing two incline prepregs, one of said two incline prepregs being set on a slant with reinforcing fibers in a predetermined direction, an other of said two incline prepregs being set on a slant with reinforcing fibers in an opposite direction to the predetermined direction.