The present invention provides an O/W emulsion composition which is excellent in UV protection ability, formulation stability, and feeling in use. The O/W emulsion composition according to the present invention is characterized by comprising the following components (a) and (b): (a) organic UV absorbers comprising the following components (a1), (a2), and (a3): (a1) octocrylene, (a2) ethylhexyl methoxycinnamate, (a3) 4-t-butyl-4'-methoxydibenzoylmethane； and (b) a polyoxyethylene/polyoxyalkylene alkyl ether block polymer represented by the following formula (1) or (2)； (Compound 1) €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒR 1 O-(PO)m-(EO)n-H€ƒ€ƒ€ƒ€ƒ€ƒ(1) wherein R 1 is a hydrocarbon group having 16 to 18 carbon atoms； PO is an oxypropylene group, EO is an oxyethylene group, and PO and EO are added to each other in block form； and m and n respectively represent average addition mole number of PO and EO, 4‰¤m<；70, 10‰¤n<；70, and m<； n； (Compound 2) €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒR 2 O-(AO)p-(EO)q-R 3 €ƒ€ƒ€ƒ€ƒ€ƒ(2) wherein R 2 and R 3 are either identical to or different from each other, and each of them is 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, and AO and EO are added to each other in block form； and p and q respectively represent average addition mole number of AO and EO, 1‰¤p‰¤70, 1‰¤q‰¤70, and 0.5<；(q/(p + q))<；0.8, and wherein average particle size of the emulsion particles comprising the component (a) is 800 nm or less.본 발명은 자외선 방어능, 제제안정성, 사용감이 우수한 O/W 유화조성물을 제공한다. 본 발명에 관한 O/W 유화조성물은 하기 성분 (a) 및 (b)를 포함하고, 성분 (a)를 함유하는 유화입자의 평균입자경이 800 ㎚ 이하인 것을 특징으로 한다: (a) 하기 (a1), (a2) 및 (a3)를 포함하는 유기 자외선 흡수제: (a1) 옥토크릴렌, (a2) 메톡시계피산 에틸헥실, (a3) 4-t-부틸-4’-메톡시디벤조일메탄； (b) 하기 화학식 1 또는 화학식 2로 표시되는 폴리옥시에틸렌·폴리옥시알킬렌알킬에테르 블록폴리머:(화학식 1)[상기 화학식에서, R1은 탄소수 16~18의 탄화수소기이고, PO는 옥시프로필렌기이며, EO는 옥시에틸렌기이다. PO와 EO는 블록 형상으로 부가되어 있다. m, n은 각각 PO, EO의 평균부가몰수를 의미하고, 4≤m＜70, 10≤n＜70, m＜n임
