Patent ID: 7235023

Claim:
An iron type golf club set of n (n: an integer equal to or more than three) numbers of iron type golf clubs having different head loft angles, wherein the set comprises at least one long iron having the head with the loft angle of not more than 28 degrees, at least one middle iron having the head with the loft angle being larger than 28 degrees and equal to or less than 41 degrees and at least one short iron having the head with the loft angle of not less than 41 degrees, each head comprises a face plate having a hitting face on its front, and a head main body provided with a face receiving portion supporting a peripheral edge portion of the face plate around an opening portion, each face plate has one thin portion having the smallest thickness and at least one thick portion having a larger thickness than the thin portion, in a free deflection area in which a back surface of the face plate faces to the opening portion, each head of the long iron and short iron comprises a weight member having a specific gravity greater than that of each head main body, the weight member of the long iron is attached to a toe side of the head main body, the weight member of the short iron is attached to a heel side of the head main body, and in a standard state where the head is mounted on a horizontal plane by a specified lie angle and loft angle, a horizontal distance Xi along the hitting face between a face center and a center of figure of the thin portion satisfies the following conditions (1) to (2): X1≦X2≦ . . . ≦Xn; and (1) X1<Xn; (2) wherein the horizontal distance Xi is negative in the case where the center of figure exists on the toe side relative to the face center, and is positive in the case where the center of figure exists on the heel side relative to the face center, and the reference symbol i is a natural number of 1 to n and is given in a sequential order from the club having the smallest loft angle in the set.