Patent ID: 7798919

Claim:
A putter head, comprising: a sole member; a face member formed of a material having a specific gravity of 2.7 to 8.0; an intermediate member formed of a material having a specific gravity of 0.9 to 3.0; a back member formed of a material having a specific gravity of 8.0 to 19.2; and a screw member screwed into the back member, wherein a depth of a center of gravity, ZGR, is a value equal to or greater than half of a head width W, namely, ZGR≧W/2, and that a moment of inertia, IY, about the center of gravity is such that 5000 g·cm 2 ≧IY≧4000 g·cm 2 , wherein a width of the intermediate member in a toe-heel direction varies in a range from a value equal to the width of the back member in the toe-heel direction and a value greater than the width of the back member in the toe-heel direction, said width of the intermediate member varying over the length of the intermediate member in a face-back direction.