In this application is disclosed a raw material liquid for a carbonated
beverage wherein Aspartame is used as a sweetener and wherein an
emulsifier having an HLB value of 1 to 14 or/and an emulsifier having a
molecular weight of 50 to 300 is/are contained, according to which the
problems which are caused by the Aspartame-attributable foam can be
solved by a method free from the problems with respect to the sensory
aspect, safety and effect sustainability of a product.