Disclosed is a hair growth promoter which can induce more efficient hair growth when applied externally, and which has little adverse side effects. Specifically disclosed is a hair growth promoter which comprises, as an active ingredient, a peptide compound containing 9 to 13 arginine residues and the amino acid sequence depicted in SEQ ID NO:1, wherein the peptide compound is a CaN/NFAT pathway-specific inhibitor having a cell membrane permeability.
