Disclosed is a foam capable of improving the foam retention of beverages, even at low temperatures. The present invention provides a foam for a carbonated beverage containing grain decomposition products, said foam comprising frozen micro particles of a carbonated beverage containing grain decomposition products and bubbles that are present between said micro particles.本發明揭示一種即便於低溫下亦可提高飲料之氣泡保持性之發泡體。根據本發明,可提供一種含穀類分解物之發泡性飲料之發泡體,其包含經凍結之含穀類分解物之發泡性飲料之微粒子、及存在於該微粒子間之氣泡。