The present invention relates to a composition for cosmetics including a polyglycerol fatty acid ester, which is an ester of polyglycerol having an average degree of polymerization of 4 to 100 with a fatty acid having 2 to 18 carbon atoms, has a hydroxyl value equal to or less than 15 mgKOH/g, and has a specific gravity at 20°C of 0.96 to 1.15 a cosmetic which includes the composition for cosmetics a method for producing an oil-in-water emulsion cosmetic which includes mixing the composition for cosmetics with a hydrophilic solvent and emulsifying and a two-separate-layer-type cosmetic, which comprises the composition for cosmetics with water, packaged in a transparent or translucent container. The present invention relates to the composition for cosmetics which can be appropriately used in producing a cosmetic giving a highly excellent feel in using and having a very good texture, a cosmetic showing a very high stability over time as an emulsion even though having a low viscosity, and a two-separate-layer-type cosmetic which can be easily dispersed uniformly by lightly shaking before using and, after using, easily separated into the original two layers, including an oily layer and an aqueous layer, and remain stable.
