PROBLEM TO BE SOLVED: To provide a hair cosmetic which includes a hair elasticity improver, and imparts excellent usability (firmness/stiffness feeling, smoothness, no sticky feeling) to hair.SOLUTION: A hair elasticity improver is composed of a taurine derivative represented by following general formula (1), and a hair cosmetic includes the hair elasticity improver. (In the formula (1), either one or both of R1 and R2 are groups represented by general formula: R3OCH2CH(OH)CH2-, and the remainder in the R1 and R2 is a hydrogen atom. M is at least one selected from a hydrogen atom, an alkali metal, an alkali earth metal, an ammonium, and organic amines. R3 is an alkyl group having a straight chain or a branch, of a carbon number of 1-8, an alkenyl group, or a hydroxyalkyl group.)COPYRIGHT: (C)2014,JPO&INPIT【課題】毛髪弾力性向上剤を含有し、毛髪に良好な使用性(ハリ・コシ感、滑らかさ、ベタツキ感の無さ)を付与する毛髪化粧料の提供。【解決手段】下記一般式(1)で表されるタウリン誘導体からなる毛髪弾力性向上剤、並びに該毛髪弾力性向上剤を含有する毛髪化粧料。(式中、R1、R2のいずれか一方/又は両方は、一般式:R3OCH2CH(OH)CH2-で表される基、残りは水素原子を表し、Mは水素原子、アルカリ金属、アルカリ土類金属、アンモニウム及び有機アミン類から選ばれる少なくとも1種を表し、R3は直鎖又は分岐した炭素数1~8のアルキル基、アルケニル基もしくはヒドロキシアルキル基を表す。)【選択図】なし
