To search a number of variation compounds having a CaSR agonist activity in order to obtain a substance having a more excellent kokumi-imparting function, and more particularly to provide a kokumi-imparting agent, which contains the foregoing substance, and a composite kokumi-imparting agent, which likewise contains the aforementioned substance and another substance having a CaSR agonist activity as well, in combination a kokumi-imparting agent comprises a lanthionine derivative and a composite kokumi-imparting agent comprising the lanthionine derivative and another substance having a CaSR agonist activity.
