| 摘要 |
A head ( 5 ) comprises a body ( 9 ), a face ( 11 ), a neck ( 13 ) and a crown ( 15 ). The crown ( 15 ) includes an outer plate ( 21 ) and an inner plate ( 23 ). The outer plate ( 21 ) and the inner plate ( 23 ) are opposed to each other with a gap provided therebetween. The outer plate ( 21 ) and the inner plate ( 23 ) are formed of a titanium alloy. The inner plate ( 23 ) has a projection ( 25 ). The upper end of the projection ( 25 ) abuts on the lower surface of the outer plate ( 21 ). The projection ( 25 ) and the outer plate ( 21 ) are bonded to each other by a spot welding method. The outer plate ( 21 ) and the inner plate ( 23 ) have thicknesses of 0.1 mm to 0.6 mm, respectively. The head ( 5 ) has a volume of 300 cm<SUP>3 </SUP>or more. A portion between the outer plate ( 21 ) and the inner plate ( 23 ) maybe filled with a synthetic resin.
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