The inventors of this invention have conducted the search for a variety of compounds which may possess a desired CaSR agonist activity to thus find out a substance capable of imparting a kokumi, which shows a more excellent kokumi-imparting effect, in particular, a kokumi-imparting effect of the initial taste-imparting type one, which is excellent in the stability and which can easily be produced at a low cost and the present invention thus provide a kokumi-imparting agent consisting of such a substance as well as a complex kokumi-imparting agent comprising the substance and other substances possessing the CaSR agonist activities in combination. More particularly, the present invention herein provides a kokumi-imparting agent consisting of ³ -Glu-Abu (L- ³ -glutamyl-L-2-amino- butyric acid) and a complex kokumi-imparting agent comprising the foregoing substance and another substance having a CaSR agonist activity, in combination.本發明係針對具有CaSR激動劑活性之很多變異化合物予以探索，以找出具較優異可賦予濃郁香味作用，尤其具有初味型可賦予濃郁香味作用，具優異安定性、簡便且低成本下可生產之可賦予濃郁香味的物質，提供由該物質所成可賦予濃郁香味劑，及由該物質與其他具有CaSR激動劑活性之物質所成複合賦予濃郁香味劑者。即，由γ-Glu-Abu(L-γ-麩胺醯肽-L-2-胺基丁酸)所成可賦予濃郁香味劑，及該物質併用其他具有CaSR激動劑活性物質所成複合賦予濃郁香味劑者。
