Patent ID: 7473191

Claim:
A hollow golf club head comprising a face portion having a club face, a crown portion, a sole portion, and a side portion between the crown portion and sole portion, extending from a toe-side edge to a heel-side edge of the club face through a back face of the head, wherein the crown portion is provided with a thickness-reduced part having a thickness of from 0.4 to 0.7 mm, and the side portion is provided with at least two vertical buttressed parts each extending from the crown portion to the sole portion and having a thickness of more than 0.6 mm but not more than 2.0 mm, and a thin part formed between the vertical buttressed parts and having a thickness of not more than 0.6 mm, wherein the vertical buttressed parts include: a toe-side vertical buttressed part extending along the toe-side edge of the face portion; a heel-side vertical buttressed part extending along the heel-side edge of the face portion; and at least one in-between vertical buttressed part therebetween, wherein the toe-side and heel-side vertical buttressed parts have a length of 5 to 50 mm along the upper edge of the side portion, and the in-between vertical buttressed part has a length of 1 to 10 mm along the upper edge of the side portion.