An emulsified skin external preparation containing a salt of a higher fatty acid ester of ascorbic acid-2-phosphate is provided, and the decomposition and consequent decrease of the salt are prevented and thereby the stability of the preparation is enhanced. A method for stabilizing the skin external preparation containing a salt of a higher fatty acid ester of ascorbic acid-2-phosphate is provided. The emulsified skin external preparation includes 0.03 to 25% by mass of a salt of a higher fatty acid ester of ascorbic acid-2-phosphate (A), and 0.05 to 25% by mass of a glycerin mono fatty acid ester (B), the higher fatty acid ester of ascorbic acid-2-phosphate being represented by Formula (1): . . . (1) wherein R is a higher fatty acid residue.