Patent ID: 7223179

Claim:
A golf club head whose thickness is thin entirely or partly or/and whose face is made of a soft material, so that when a golf ball is hit with said golf club head at a speed falling in a range of speeds generated when an ordinary golfer hits said golf ball, a ratio of a time period T 2 in which said face of said golf club head is in contact with said golf ball to a time period T 1 from a time of contact between said golf club head and said golf ball until a time when a vertical force acting on said face of said golf club head takes a peak value is not less than 1.9 nor more than 2.2, wherein a metal plate to be disposed on a face of a wood golf club head has a thickness of 1.5 to 2.7 mm and a modulus of elasticity of 1000 to 21000 kgf/mm 2 ; and a metal plate to be disposed on a face of an iron golf club head has a thickness of 1.5 to 2.5 mm and a modulus of elasticity of 800 to 21000 kgf/mm 2 .