To match a nominal loft angle and an affective loft angle.

The ball hitting surface height (IC) obtained by adding the height of a chamfer 3 at the bottom end of a club face 2 to the height of the club face is confined within a range expressed by equation: (2S-chamfer height)-6≤(IC)≤(2S-chamfer height)+6. In the equation, S is the height up to the point where the ball existing on a ground surface or grass and the club face come into contact at the time of hitting a ball. The height S is expressed by S = (the radius of the ball) × {1-sin(loft angle)}.