The purpose of the present invention is to provide a novel substance which has an activity of inhibiting an angiotensin-converting enzyme and/or an activity of promoting the adhesion between a fibroblast and collagen. A peptide comprising an amino acid sequence represented by formula (I): Xaa1-Asp-Leu-Asp-Val-Xaa2 (SEQ ID NO: :1) [wherein Xaa1 and Xaa2 may be present or absent and, if present, independently represent an arbitrary amino acid residue], a derivative of the peptide, or a salt of the peptide or the derivative.