An object of the present invention is to provide a premix for preparing an emulsion composition and an emulsion composition using the same, which can easily prepare a food containing a polyunsaturated fatty acid such as DHA or EPA. Foods containing highly unsaturated fatty acids such as DHA and EPA can be easily prepared by mixing highly unsaturated fatty acid-containing fats and oils with predetermined fats and oils and then mixing with a certain amount of aqueous solvent to form an oil-in-water emulsion. The emulsion composition could be made into a premix for preparation. By using this premix, food products such as beverages in which the off-flavor derived from highly unsaturated fatty acids is suppressed can be easily prepared.本発明の課題は、DHAやEPAなどの高度不飽和脂肪酸を含有する食品を容易に調製できる、乳化組成物調製用プレミックス、及びそれを用いた乳化組成物を提供することにある。高度不飽和脂肪酸含有油脂を所定の油脂と混合後に一定量の水系溶媒と混合して水中油型乳化物とすることで、DHAやEPAなどの高度不飽和脂肪酸を含有する食品を容易に調製できる、乳化組成物調製用プレミックスとすることができた。本プレミックスを用いることで、高度不飽和脂肪酸に由来する異風味が抑制された飲料等の食品を容易に調製することができる。