An emulsion cosmetic composition of the oil-in-water type for sun protection, containing: (A) 1 to 7.5% by mass of octyl methoxycinnamate； (B) 1 to 4% by mass of t-butyl-methoxy-dibenzoyl methane and / or 2-hydroxy-4-methoxybenzophenone； (C) 0.5 to 3% by mass of a polyoxyethylene / polyoxyalkylene alkyl ether block copolymer represented by the following formula (1) or (2): R1O- (AO) m- (EO) n-H. . . (1) [in formula (1), R1 is a hydrocarbon group having from 16 to 18 carbon atoms, AO is an oxyalkylene group having from 3 to 4 carbon atoms, AO and EO are bound together in the form of blocks , myn each represent an average number of moles of addition of AO and EO, respectively, and m>； 4, n>； 10 and n>； m]； R2O- (AO) p- (EO) q-R3. . . (2) [in formula (2), R2 and R3, which may be the same or different from each other, each represents a hydrocarbon group having 1 to 4 carbon atoms, AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, AO and EO are joined in block form, each of p and q represents an average number of moles of addition of AO and EO, respectively, and 1 <；= p <；= 70, 1 <；= q <；= 70 and 0.2 <；(q / (p + q)) <；0.8], and (D) 10% by mass or more of non-polar hydrocarbon oil selected from the group consisting of hydrogenated polydecene, mineral oil and squalene, for the total amount of the oily component； wherein the average diameter of emulsion particles is 700 nm or less.Una composición cosmética en emulsión del tipo aceite-en-agua para protección solar, que contiene: (A) 1 a 7,5% en masa de metoxicinamato de octilo； (B) 1 a 4% en masa de t-butil-metoxi-dibenzoil-metano y/o 2-hidroxi-4-metoxibenzofenona； (C) 0,5 a 3% en masa de un copolímero de bloques de éter alquílico de polioxietileno/polioxialquileno que se representa por la siguiente fórmula (1) o (2): R1O-(AO)m-(EO)n-H . . . (1) [en la fórmula (1), R1 es un grupo hidrocarbonado que tiene de 16 a 18 átomos de carbono, AO es un grupo oxialquileno que tiene de
