Patent ID: 7691008

Claim:
A golf club head having a hollow shell structure comprising: a main frame provided with three independent openings which are a front opening, a top opening and a bottom opening; a face plate covering the front opening, the face plate comprising a face portion forming the clubface of the head and a turnback extending backwards from at least a part of the peripheral edge of the clubface; a crown plate covering the top opening; and a sole plate covering the bottom opening, wherein the specific gravity Gm of the main frame, the specific gravity Gc of the crown plate, the specific gravity Gf of the face plate and the specific gravity Gs of the sole plate satisfy the following condition: Gm>Gf>Gs>Gc, the specific gravity Gf is not less than 3.0 and not more than 5.0, and the specific gravity Gm is not less than 4.0 and not more than 7.0, wherein said main frame includes an upper frame between the front opening and the top opening which forms a front part of the crown portion extending in a heel-and-toe direction of the head, and the minimum length of the upper frame in a back-front direction of the head is not less than 5 mm and not more than 30 mm.