The present invention provides an oil-in-water emulsion composition being excellent in preparation stability, feelings in use and UV shielding ability. The composition of this invention is an oil-in-water emulsion composition, in which the following first and second oil phase are respectively and individually dispersing in the water phase: (i) The first oil phase obtained by using a polyoxyethylene.polyoxyalkylene alkyl ether block polymer of formula (1) or (2) as emulsifier to form the organic UV absorbent-containing oil phase, with its average particle diameter being 700 nm or less； (ii) The silicone- containing second oil phase obtained by using an alkyl modified carboxylvinyl polymer as emulsifier. R1O-(PO)m-(EO)n-H (1) [R1 is C16-18 hydrocarbon group； PO is oxypropylene group； EO is oxyethylene group； PO and EO are adducted in block shape, m and n respectively represent the average adduction moles of PO and EO, wherein 70 >； m >； 4, 70 >； n >； 10, n >； m] R2O-(AO)p-(EO)q-R3 (2) [R2 and R3 are the same or different, respectively represent C1-4 hydrocarbon group； AO represents a C1-4 oxyalkylene group； EO represents an oxyethylene group； AO and EO are adducted in block shape； p and q respectively represent the average adduction moles of AO and EO, wherein 1 &le； p &le； 70, 1 &le； q &le； 70, 0.2 <； (q/(p+q)) <； 0.8.]本發明提供一種製劑安定性、使用感、紫外線防禦能力優異之O/W乳化組成物。本發明之組成物係下述第1油相與第2油相分別各自分散於水相中的O/W乳化組成物：(i)以通式(1)或(2)之聚氧伸乙基/聚氧伸烷基烷基醚嵌段聚合物作為乳化劑所形成之含有有機紫外線吸收劑的平均粒徑在700nm以下之第1油相；(ii)以烷基改質羧基乙烯聚合物作為乳化劑所形成之含有矽油的第2油相，R1O-(PO)m-(EO)n-H (1)[R1係碳數16至18之烴基；PO係氧伸丙基、EO係氧伸乙基，PO與EO係嵌段狀地加成；m、n分別為PO、EO之平均加成莫耳數，且70>；m>；4，70>；n>；10，n>；m]R2O-(AO)p-(EO)q-R3 (2)[R2、R3可相同或不同，分別為碳數1至4之烴基；AO係碳數3至4之氧伸烷基、EO係氧伸乙基，AO與EO係嵌段狀地加成；p、q分別為AO、EO之平均加成莫耳數，1≦p≦70，1≦q≦70，且0.2<；(q/(p+q))<；0.8]。
