Patent ID: 8727910

Claim:
A golf club head comprising: a face part; a sole part; and a crown part, wherein the head is hollow; the head has an inner surface on which a rib (X 1 ) and a rib (X 2 ) are provided, the rib (X 1 ) and the rib (X 2 ) having a height greater than a thickness; the rib (X 1 ) and the rib (X 2 ) are separated from the face part and separated from the crown part; extending directions of the rib (X 1 ) and the rib (X 2 ) are inclined with respect to a front-back direction of the head in a projected image obtained by projecting the head setting to the standard condition on a horizontal plane H; the rib (X 1 ) extends toward a heel side in the direction of a backside of the head, and the rib (X 2 ) extends toward a toe side in the direction of the backside of the head; the rib (X 1 ) and the rib (X 2 ) have a height change part formed in a face side end part of the ribs, the height change parts having a height gradually lowered as approaching rib end parts; a ratio [Rh/Rt] of a height Rh of the rib (X 1 ) to a thickness Rt of the rib (X 1 ) is 2 or greater and 20 or less, and a ratio [Rh/Rt] of a height Rh of the rib (X 2 ) to a thickness Rt of the rib (X 2 ) is 2 or greater and 20 or less; and a rib (Y) having a height equal to or less than a thickness and lower than the maximum height of the rib (X 1 ) and the rib (Y) connects the height change part of the rib (X 1 ) to the height change part of the rib (X 2 ).