PURPOSE: To obtain the subject composition having improved heat stability and freezing and thawing stability and good taste, flavor, physical properties, palatability, etc., by specifying the volume-based average particle diameter of oil droplets dispersed in water phase.

CONSTITUTION: An acidic o/w-type emulsion composition having improved emulsion stability can be prepared by adjusting the volumebased average particle diameter of the oil droplets dispersed in water phase to 0.1-1.0μm, preferably 0.2-0.7μm. The composition can be prepared by preparatorily emulsifying an oil in the presence of an emulsifier and emulsifying the obtained emulsion composition with a high-pressure emulsifier under a pressure of ≥350kg/cm2, preferably ≥500kg/cm2.