Water-in-oil emulsion sunscreen cosmetic that improves the effect of ultraviolet protection, which characteristically comprises the following (a) to (g): (a) ultraviolet absorber, which is one, two or more selected from a group that is ethylhexyl methoxycinnamate, octocrylene, polysilicone-15, t-butyl methoxydibenzoylmethane, ethylhexyl triazone, dietilaminohidroxibenzoilhexil benzoate, bis ethylhexyloxyphenol methoxyphenyl triazine, oxibenzona3, methylene bis benzotriazolyl tetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate and ethylhexyl salicylate； (b) silicone powder structure, which is polymethylsilsquioxane； (c) methyl polymethacrylate powder； (d) hydrophobicized plate-shaped powder, which is talc treated with dimethylpolysiloxane； (e) surfactant； (f) oil component； (g) water； wherein the content of (b) polymethylsilylsquioxane, the content of (c) methyl polymethacrylate powder and the content of (d) talc treated with dimethylpolysiloxane is each 0.1-6% by weight, with respect to the Total amount of water-in-water emulsion sunscreen cosmetic.Cosmético de filtro solar de emulsión de agua en aceite que mejora el efecto de protección ultravioleta, que comprende característicamente lo siguiente (a) a (g): (a) absorbente de ultravioleta, que es uno, dos o más seleccionados de un grupo que consiste en etilhexil metoxicinamato, octocrileno, polisilicona-15, t-butilmetoxidibenzoilmetano, etilhexil triazona, dietilaminohidroxibenzoilhexil benzoato, bis etilhexiloxifenol metoxifenil triazina, oxibenzona3, metilen bis benzotriazolil tetrametilbutilfenol, ácido fenilbencimidazol sulfónico, homosalato y salicilato de etilhexilo； (b) estructura de silicona en polvo, que es polimetilsilsesquioxano； (c) polimetacrilato de metilo en polvo； (d) polvo hidrofobizado en forma de placa, que es talco tratado con dimetilpolisiloxano； (e) tensioactivo； (f) componente de aceite； (g) agua； en el que el contenido de (b) polimetilsilsesquioxano, el contenido de (c) poli
