Abstract: The present invention is a golf putter head wherein the second moment among the three inertial moments described below shows a minimum value in a state in which the head is placed on a horizontal plane at a specified lie angle and loft angle: First moment: inertial moment of the head about a first axis which passes through the center of gravity of the head, and which is parallel to the face surface and said horizontal plane; Second moment: inertial moment of the head about a second axis which is an axis in the vertical direction that passes through the center of gravity of the head; and Third moment: inertial moment of the head about a third axis which passes through the center of gravity of the head, and which is perpendicular to said first axis and perpendicular to said second axis.

Abstract: A wood-type golf club head having a head volume of not less than 300 cc comprises a head main body having a club face for striking a golf ball and a hosel defining a shaft center line (CL) corresponding to the center line of a club shaft, wherein the center of gravity (G) of the club head is disposed at a distance (L) of from 26 to 36 mm from said shaft center line (CL), a sweet spot (s) on the club face is disposed at a distance of not more than 3 mm from a club face center (c) of the club face, the club face has a toe-side end (Fe) disposed at a distance (B) of from 13 to 30 mm in the toe-heel direction towards the heel from a toe-side end (Te) of the club head, and a heel end (He) of the club head is disposed at a distance (A) of from 10 to 16 mm from the shaft center line (CL).

Abstract: A wood-type golf club comprises a club shaft and a club head, wherein a club length is in a range of from 43 to 48 inches, a volume of the club head is in a range of not less than 250 cc, and a torque T in degree of the club shaft and a gravity point distance L in mm between the gravity point of the club head and the center line of the club shaft satisfy conditions (1) T≧0.143L−2.79 and (2) T≦0.286L—7.14.

Abstract: A golf club comprises a club shaft and a hollow club head, wherein the club head has a loft angle of from 14 to 18 degrees, a head volume of not less than 250 cc, and a sweet spot at a vertical distance of from 1 to 5 mm downwards of a face center, and the club shaft has a variable flexural rigidity whose minimum is in a range of from 5 to 10 N·m2, and the minimum flexural rigidity occurs in a range between 0% and 40% of the length of the club shaft from the end of the club shaft.

Abstract: A wood-type golf club head which has a head volume of not less than 320 cc, a gravity point distance (c) in a range of from 25 to 35 mm, and a heel area width (A) in a range of from 30 to 52% of a clubhead width (B).

Abstract: An iron-type golf club head comprises a face portion whose surface defines a club face for hitting a ball, the face portion is provided with a thin part which is defined as having a thickness of not more than 3 mm, the thin part defines at least a part of the club face including a sweet spot, and the distance across the thin part measured in every direction is not less than 30 mm.

Abstract: A wood-type golf club head having a head volume of not less than 300 cc comprises a head main body having a club face for striking a golf ball and a hosel defining a shaft center line (CL) corresponding to the center line of a club shaft, wherein the center of gravity (G) of the club head is disposed at a distance (L) of from 26 to 36 mm from said shaft center line (CL), a sweet spot (s) on the club face is disposed at a distance of not more than 3 mm from a club face center (c) of the club face, the club face has a toe-side end (Fe) disposed at a distance (B) of from 13 to 30 mm in the toe-heel direction towards the heel from a toe-side end (Te) of the club head, and a heel end (He) of the club head is disposed at a distance (A) of from 10 to 16 mm from the shaft center line (CL).