The present invention provides a novel flavor improving agent capable of sufficiently enhancing or alleviating the flavor sensed in oral cavity; for example, enhancing and improving the thickness in taste or the like to provide depth and profoundness to the flavor, and also improving the sense of volume or the sharpness of aftertaste. The present invention also provides a food/drink, a pharmaceutical product and an oral care product having a good taste which can fulfill the recent high-level demand for taste.