PURPOSE: To obtain the titled drink which can be diluted with water or carbonated water without producing the flocculation and precipitation for a long period, by adding arginic acid propylene glycol ester, etc. to an acidic drink containing proteins at a specific concentration, and homogenizing the mixture.

CONSTITUTION: An acidic drink having a pH of ≤4.2 and containing 0.1W 5w/w% protein is incorporated with (A) arginic acid propylene glycol ester, (B) an oil or fat emulsion (obtained by adding and homogenizing 0.5W3pts. of an oil or fat to a mixture of 1pt. of water and 0.005W0.1pt. of a sucrose fatty acid ester at 40W70°C) and (C) a sucrose ester and/or a glycerol fatty acid ester, and homogenizing the mixture e.g. with a homogenizer to obtain the objective drink.