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; and a two-separate-layer-type cosmetic, which comprises the composition for cosmetics. 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, and a two-separate-layer-type cosmetic.