Patent ID: 7144337

Claim:
An iron type golf club head having a face portion in which an annular trench surrounding a central region that includes a sweet spot is provided on the back surface of the face portion, characterized in that, in the standard condition wherein the head is placed on a horizontal surface with prescribed lie angle and loft angle, said trench includes: an upper side trench portion that is positioned above a horizontal border line on a face surface through the sweet spot by which the face surface and a line passing through a center of gravity of the head and right-angled to the face surface crosses; and a lower side trench portion that is positioned beneath the horizontal border line, and in that a ratio (Wu/Wd) of the average trench width Wu of said upper side trench portion to the average trench width Wd of the lower side trench portion is 2.5 to 5.0.