Patent ID: 8591354

Claim:
A golf club head comprising a face, a crown, and a sole, wherein when a length of a cross section CS 1 in a face-back direction is defined as L, the cross section CS 1 positioned at a center position in a toe-heel direction; a point being 0.1 L from a forefront point of the cross section in the face-back direction and positioned on an outer surface of the sole is defined as Ma; a point being 0.2L from a backmost point of the cross section in the face-back direction and positioned on the outer surface of the sole is defined as Md; intersection points of lines and the outer surface of the sole are defined as a point Mb and a point Mc from a face side in order, the lines equally dividing a distance between the point Ma and the point Md into three in the face-back direction; a distance of a cross section CS 2 in the toe-heel direction is defined as W, the cross section CS 2 being 20 mm from a forefront point of the head and being parallel to the toe-heel direction; intersection points of lines and the outer surface of the sole are defined as a point Mp, a point Mq, and a point Mr from a toe side in order, the lines equally dividing the distance W into four in the toe-heel direction, then a radius of a circle passing through the point Ma, the point Mb, and the point Mc is defined as Ra, wherein the radius Ra is equal to or greater than 250 (mm); a radius of a circle passing through the point Mb, the point Mc, and the point Md is defined as Rb, wherein the radius Rb is equal to or less than 200 (mm); and a radius of a circle passing through the point Mp, the point Mq, and the point Mr is defined as Rc, wherein the radius Rc is equal to or less than 130 (mm), and a ratio [Ra/Rb] is equal to or greater than 3; a ratio [Rb/Rc] is 1.1 or greater and 3 or less; and a ratio [Ra/Rc] is equal to or greater than 4.