GOLF CLUB HEAD, IRON GOLF CLUB HEAD, WOOD GOLF CLUB HEAD, AND GOLF CLUB SET

摘要

A golf club head (11) has an ellipsoid of inertia (12) with its center at a center of gravity G. When the ellipsoid of inertia (12) is virtually cut with a plane passing through the center of gravity of the golf club head (11) and being parallel to a face surface (11f), a major axis of a plane ellipse (13) appearing on its cut surface forms an angle ofθwith an intersecting line (15) of the cut surface and a ground surface (16). The major axis extends upward and away from the ground surface (16) as it approaches a toe part (11t). The angleθis not smaller than 0.5 DEG and not larger than 9.5 DEG . An aspect ratio a/b defined by a ratio of the length a of the major axis (13d) to the length b of a minor axis (13e) of the plane ellipse (13) is not smaller than 1 and not larger than 4.