Patent ID: 7695378

Claim:
A hollow golf club head comprising a face portion whose front face defines a club face for hitting a golf ball, a crown portion intersecting the club face at an upper edge thereof, a sole portion intersecting the club face at a lower edge thereof, a side portion between the crown portion and the sole portion which extends from a toe-side edge to a heel-side edge of the club face through a back face of the club head, a main body made of a metal material and having the face portion, the sole portion and at least one opening, said at least one opening being an upper opening formed in at least a part of the crown portion, and a cover member made of a fiber reinforced resin and attached to the main body so as to close the opening, wherein the cover member comprises an outline including a wavy part extending in a cyclical waveform having a periodic oscillation, and the wavy part has a length that includes not less than 1.5 cycles of the waveform, the main body has a support portion being provided around the opening for supporting an inner surface of a periphery of the cover member, and the edge of the opening comprises an outline including a wavy edge part extending in a cyclical waveform having a periodic oscillation, and the wavy edge part has a length that includes not less than 1.5 cycles of the waveform, wherein the phases of the wavy part of the cover member are substantially synchronized with the phases of the wavy edge part of the opening so that a width of the support portion is substantially constant at all regions of the wavy part of the opening.