Patent ID: 7300360

Claim:
A golf club, in a reference state in which the golf club is placed on a horizontal plane with a predetermined lie angle and face angle, and the shaft axis line thereof is disposed within a reference plane that is perpendicular to the horizontal plane, the golf club having: a center of gravity of the head being positioned on the back side of the head from the reference plane, and a depth of the center of gravity that is a distance between the reference plane and the center of gravity of the head being 20 mm or greater and 30 mm or less; a flexural rigidity value EIt (kgf·mm 2 ) of the shaft at a position 140 mm away from the tip on the head side being 0.5×10 6 or greater and 1.75 ×10 6 or less; and a value of a ratio of a torsional rigidity value GIt to the flexural rigidity value EIt (GIt/EIt) being 0.8 ×10 −2 or greater and 1.2 ×10 −2 or less as determined when the torsional rigidity value of the shaft at a position 140 mm away from the tip on the head side is defined as GIt (kgf·mm 2 ).