| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase the degree of freedom in designing in centroid position adjustment and to reduce a production cost by lowering the centroid by shortening the length of a head hosel part. SOLUTION: A head 1 is formed by a powder metal injection molding method. A pipe-like shaft 6 is inserted and adhered into a shaft insertion hole 4 disposed at the hosel part 3 of the head 1. A rod-like core part 5 prepared by inserting and adhering the shaft 6 in the central shaft part of the shaft insertion hole 4 is coaxially and integrally formed and the length size 1 of the rod-like core part 5 is set longer (1>L) than the length size of the hosel part 3.</p> |
