An object of the present invention is to provide a carbonated beverage containing soybean powder or soymilk, wherein the carbonated beverage is provided with a refreshing carbonic acid flavor as well as nutrients and good flavor derived from soybeans, and the soybean-derived ingredient is stably maintained without becoming coagulated even when the content of the soybean-derived ingredient is high. By adjusting the pH of the carbonated beverage containing soybean powder and/or soymilk to 5.7 or higher, it is possible to stably maintain the soybean-derived ingredient without coagulation, and to provide the beverage with a refreshing carbonic acid flavor as well as nutrients and good flavor derived from soybeans.
