Patent ID: 7500924

Claim:
A hollow golf club head comprising a face portion whose front face defines a club face for striking a golf ball, a sole portion intersecting the club face at the lower edge thereof, at least one groove being provided in an outer surface of the sole portion, the groove extending in a V-shaped formation whose corner portion is smoothly bended and protrudes toward a leading edge of the head, the groove having a ratio (W/L) of a length W in its front-rear direction to a length L in its toe-heel direction being from 0.20 to 1.50, and a distance between the leading edge and the corner portion of the groove being in the range of from 5 to 30 mm in the front-rear direction, wherein the groove has a width in the range of from 2 to 12 mm and a depth in the range of from 0.5 to 2.0 mm, and the length of the groove measured along the center line thereof is in the range of from 1.0 to 1.6 times the maximum dimension of the sole portion measured along the toe-heel direction.