A golf club head comprises has an inner surface including a back surface of the face portion that is provided with a crown-side thick-walled rib and a sole-side thick-walled rib. The crown-side thick-walled rib includes an upper face rib disposed in the face portion and extending from the central thick-walled part to a peripheral edge of the back surface of the face portion on a crown portion side, and a crown rib disposed in the crown portion and extending backwardly of the head from the upper face rib. The sole-side thick-walled rib includes a lower face rib disposed in the face portion and extending from the central thick-walled part to a peripheral edge of the back surface of the face portion on a sole portion side, and a sole rib disposed in the sole portion and extending backwardly of the head from the lower face rib.