An iron club set is provided that gives a preferred shot sound corresponding to the number of the club, low center of mass with higher number clubs and best shot conditions within the set.

Each number of club of the iron club set is provided with a golf head with an edge wall on the toe, heel, top and sole on the back side of a face part 2 and back wall 2e via a space with the face part 2 that is attached on the back side of the sweet spot of the sole edge wall 2d. The height of the back wall 2e is more than 17.0 mm in the lower number of clubs and less than 17.0 mm in the higher number of clubs.