Provided is an oil-in-water emulsifiable cosmetic, which has excellent emulsion stability, even after a long period, and gives an user excellent feelings as being tacky-free. The oil-in-water emulsifiable cosmetic is characterized in that it contains the following components (a) to (d): (a) one or two or more of amphipathic substances selected from (a1) to (a3): (a1) an amphipathic protein, (a2) a copolymer of 2-acrylamide-2-methylpropanesulfonic acid or a salt thereof/vinyl pyrrolidone, (a3) a microgel (b) particles with average particle diameters of less than 500 nm (c) an oil-based ingredient and (d) a water-based ingredient.The microgel is in a composition where an organic solvent or oil is used as a dispersion medium, and water is used as a dispersing phase. Water-soluble vinyl unsaturated monomers are dissolved in the dispersing phase, and the monomers undergo free-radical polymerization in the dispersing phase to obtain the microgel. The aforesaid microgel is obtained by undergoing free-radical polymerization of dimethyl acrylamide and 2-acrylamide-2-methylpropanesulfonic acid, under the condition that a phase of a microemulsion or micro W/O emulsion is formed by using a surfactant.本發明提供一種水中油型乳化化妝料,其乳化安定性及經時乳化安定性為優異,且不黏稠性等使用感亦為優異。本發明的水中油型乳化化妝料之特徵為含有下述(a)至(d):(a)由(a1)至(a3)選出的1種或2種以上的兩親媒性物質:(a1)兩親媒性蛋白質、(a2)2-丙烯醯胺-2-甲基丙烷磺酸或其鹽/乙烯基吡咯啶酮的共聚物、(a3)微凝膠,其係在以有機溶媒或油分做為分散媒且以水做為分散相的組成物中,將水溶性乙烯性不飽和單體溶解於分散相,並在分散相中進行自由基聚合而得的微凝膠,前述微凝膠是在藉由界面活性劑而形成一相微乳液或微細W/O乳液的條件下,將二甲基丙烯醯胺與2-丙烯醯胺-2-甲基丙烷磺酸進行自由基聚合而得者;(b)平均粒徑未達500nm的粒子;(c)油性成分;(d)水性成分。
