PROBLEM TO BE SOLVED: To provide an agent and method for enhancing saltiness suitable for food and drink products, and a tryptophan-containing peptide having ability for activating hENaC.SOLUTION: An agent for enhancing saltiness includes at least one dipeptide selected from Trp-X and X-Trp, where X represents an amino acid selected from Phe, Leu, Trp, Ala, Arg, Asn, Asp, Cys, Gln, Gly, His, Ile, Lys, Met, Pro, Ser, Thr, Tyr, and Val.