Provided is a hair repair composition that improves the breaking strength of hair at least once. A hair repair composition comprising a keto acid having a carboxyl group and a ketone group or a carbonyl group in one molecule, a water-soluble polymer thickener, and a water-soluble humectant, and after the damage The composition for hair restoration which improves the breaking strength of the said hair by apply coating to hair of this, washing with water, and making it dry. [Selection figure] None【課題】少なくとも一回の使用で、毛髪の破断強度を向上させる毛髪修復用組成物の提供。【解決手段】１分子中にカルボキシル基とケトン基又はカルボニル基を有するケト酸と、水溶性高分子増粘剤と、水溶性保湿剤と、を含有する毛髪修復用組成物であり、損傷後の毛髪に塗布し、水洗し、乾燥させることで、当該毛髪の破断強度を向上させる毛髪修復用組成物。【選択図】なし
