A set of iron-type golf clubs comprising “n” pieces of golf clubs having club heads with different loft angles and having advantages that variation in spin amount at mis-shots by long irons is small and accuracy in shots of intentionally curving a ball by short irons is high, each of the club heads having face 4 provided with a plurality of face grooves 10 extending in the toe-heel direction and a plurality of auxiliary grooves 11 including a plurality of first auxiliary grooves 11a extending in at least a region between toe side line L1 and heel side line L2, the first auxiliary grooves 11a being, in this region, in the form of curved grooves convex upward such that a curve descends from peak 13 toward the toe and heel side lines L1 and L2, and average degrees of curvature θi of the first auxiliary grooves of the club heads satisfying a specific relationship.