Abstract: [Problem] To provide a carbonate stimulation enhancer that allows maintenance of carbonate stimulation even for carbonated beverages that have reduced “carbonate stimulation sensation” because of decreased gas pressure during packing according to ingredients, decreased gas pressure due to gas permeability of containers or rapid degassing of gaseous carbonic acid after opening a container. [Solution] Provided is a carbonate stimulation enhancer for enhancing and maintaining preferable carbonate stimulation of gaseous carbonic acid, which is obtained by the addition of an undecatriene and/or an undecatetraene as an active component to a carbonated beverage.