Patent ID: 8801542

Claim:
A golf club comprising a club shaft and a golf club head attached to the tip end of the club shaft, wherein the length of the golf club is from 45 to 47 inches, the volume V of the golf club head is from 440 to 470 cu·cm, the moment of inertia M of the golf club head around the center line of the club shaft is 5500 to 6500 g sq·cm, and the ratio M/V of the moment of inertia M (g sq·cm) to the volume V (cu·cm) is from 11.0 to 13.5, and said golf club head comprises a face portion having a club face for hitting a ball, a crown portion defining the top surface of the golf club head, a sole portion defining the bottom surface of the golf club head, and a side portion between the crown portion and sole portion, extending from a toe-side edge of the club face to a heel-side edge of the club face through a back face of the golf club head, and provided with a toe-side opening, which portions are made of a material having a specific gravity ρ2, and wherein said side portion is provided with a toe-side opening and a side toe member closing said toe-side opening and forming a toe-side part of the side portion, said side toe member being made of a material having a specific gravity ρ1 which is less than 1.0 times but not less than 0.23 times the specific gravity ρ2.