PROBLEM TO BE SOLVED: To provide a method for improving the solubility of a poorly water-soluble component into water, which can be applied to cosmetics such as aqueous cosmetics.SOLUTION: The method for improving the solubility of a poorly water-soluble component includes blending a compound represented by formula (1) with a poorly water-soluble component in the presence of water (R1 is a group represented by formula (2) or a C2-3 hydrocarbon group) (R2 is a C1-3 alkylene group； n is 0 or 1).SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】水性化粧料などの化粧料に応用可能な、難水溶性成分の水への溶解性を向上させる方法の提供。【解決手段】水の存在下で、式（１）で表される化合物及び難水溶性成分を配合することを含む、前記難水溶性成分の溶解性を向上させる方法。（Ｒ１は式（２）で表される基又はＣ２若しくは３の炭化水素基）（Ｒ２はＣ１～３のアルキレン基；ｎは０又は１）【選択図】なし
