| 摘要 |
A golf club shaft ( 10 ) composed of a metal tube and having a weight not less than 50 g and less than 85 g. A rib ( 21 ) is formed on an inner peripheral surface of the golf club shaft ( 10 ) and/or a peripheral surface thereof. A rigidity value (EI value) of the golf club shaft ( 10 ) at a position spaced at 90 mm from a head-side front end ( 12 ) thereof is set to not less than 1.0 kg.mm<SUP>2 </SUP>nor more than 2.5 kg.mm<SUP>2</SUP>. An outer diameter (D 1 ) of the golf club shaft ( 10 ) at a position spaced at 30 mm from the head-side front end ( 12 ) thereof is set to not less than 9.5 mm nor more than 15.0 mm.
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