Iron type golf club set

An iron type golf club set, comprising a set of “n” iron type golf clubs, “n” being an integer of 3 or more, the golf clubs each having a different loft angle of a face for hitting a ball, wherein

• when a head of each iron type golf club is inclined at a specified lie angle with respect to a horizontal plane and the face is at a specified loft angle to a vertical plane, head moment of inertia “A” per unit mass represented by a ratio MI/m of a moment of inertia “MI” of a head alone around a horizontal axis passing through a head center of gravity and being parallel to the face to head mass “m” increases in the order from an iron type golf club with the smallest loft angle to an iron type golf club with the largest loft angle, and
• a difference An−A1 between head moment of inertia “An” per unit mass of the iron type golf club with the largest loft angle and head moment of inertia “A1” per unit mass of the iron type golf club with the smallest loft angle is 0.30 (g·cm2/g) or more.