Disclosed is a taste-improving agent for a sweetener having high sweetness to be added to foods or drinks containing sweeteners having high sweetness, which can effectively inhibit, even in a small amount, the unpleasant bitterness, harsh taste and astringent taste characteristic to sweeteners having high sweetness without altering the inherent flavors of foods, and which can reproduce the same taste intensity and flavor profile by using a sweetener having high sweetness as in the case of using a sugar such as sucrose, characterized by comprising components (A), (B) and (C) together with (D) and/or (E):(A) spirantol or an extract or essential oil of a plant containing spirantol(B) quinic acid or a composition containing quinic acid(C) vanilla polyphenol or a composition containing vanilla polyphenol(D) green tea polyphenol or a composition containing green tea polyphenol and(E) rosaceae polyphenol or a composition containing rosaceae polyphenol.
