Abstract: A peptide or a salt thereof having an amino acid sequence represented by (a) or (b) shown below having a promotive effect on a proliferation of fibroblast cells, a composition for enhancing proliferation of fibroblast cells containing one or more of them, a composition for enhancing elastin production in fibroblast cells containing one or more peptides or salts thereof having an amino acid sequence represented by (a), (b) or (c) shown below and a composition for enhancing elastin production in chondrocytes containing one or more peptides or salts thereof having an amino acid sequence represented by (c) shown below.