Provided is an oil-in-water emulsion cosmetic composition having a high UV protection or blocking effect (particularly, boost effect of SPF value) and excellent water resistance and the like of a film (e.g., cosmetic film) without impairing the tactile sensation or the feeling of use particular to the oil-in-water emulsion cosmetic composition. The oil-in-water emulsion cosmetic composition comprises: (A) a carboxylic acid-modified silicone in a liquid form at 50° C., (B) a vinyl-based polymer emulsion, (C) a basic compound, and (D) an inorganic UV protecting agent consisting of hydrophobic fine particulate metal oxide. The oil-in-water emulsion cosmetic composition is useful as a sunscreen cosmetic composition.