Disclosed is a flavor enriching agent comprising a substance discovered by searching for a number of variation compounds having a CaSR agonizing activity. Said substance exhibits an improved flavor enriching action particularly with respect to initial tastes exhibits an improved stability and can be produced by a simple method at a low cost. Also disclosed is a composite flavor enriching agent comprising said substance and another substance having a CaSR agonizing activity. Specifically disclosed are a flavor enriching agent comprising Glu Nva (L glutamyl L norvaline) and a composite flavor enriching agent comprising the aforesaid substance together with another substance having a CaSR agonizing activity.
