| 摘要 |
A shaft 6 is formed by a prepreg sheet. The sheet of the shaft 6 includes full length sheets (a2), (a3), (a8) and (a11) provided wholly in a longitudinal direction of the shaft, and partial sheets (a1), (a4), (a5), (a6), (a7), (a9), (a10) and (a12) provided partially in the longitudinal direction of the shaft. The number of the full length sheets is equal to or greater than two. The number of the partial sheets is equal to or greater than four. Each of the partial sheets has an end. When four sections obtained by dividing the shaft into four equal parts in the longitudinal direction are set to be first, second, third and fourth sections from a tip end side in order, the total number of ends positioned in the first section is represented as (N1), the total number of ends positioned in the second section is represented as (N2), the total number of ends positioned in the third section is represented as (N3), and the total number of ends positioned in the fourth section is represented as (N4), all of (N1), (N2), (N3) and (N4) are equal to or greater than one.
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