| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve a using of a material having a strength and rigidity comparable to metal while improving a hitting sound. SOLUTION: A head body 1 having an outer shell structure is made of a fiber-reinforced thermoplastic synthetic resin (FRTP) material. A relational expression between the thickness (t:mm) and the young modulus (E:kgf/mm<2> ) of a minimum part of a crown surface part 1C or a sole surface part 1D of the head body 1 or those of the both satisfies Et<3> <2×10[kgfmm].</p> |
