PROBLEM TO BE SOLVED: To provide a foam retention improving agent capable of improving foam retention of beverages even at a low temperature.SOLUTION: The foam retention improving agent containing a frozen fine particle of a grain degradation product-containing foaming beverage is used.【課題】低温であっても飲料の泡持ち向上可能な泡持ち向上剤の提供。【解決手段】穀類分解物含有発泡性飲料の凍結微粒子を含む泡持ち向上剤を用いる。【選択図】なし