PROBLEM TO BE SOLVED: To obtain a first reduction agent for hair deformation, which makes hair deformation simply and semipermanently durable by the heat of an iron for high-temperature hair dressing or a trowel even without using a rod and an agent for hair deformation comprising the first reduction agent for hair deformation as a constituent component and to provide a method for hair deformation using the agent for hair deformation.SOLUTION: In the first reduction agent for hair deformation comprising at least a reducing agent, an alkali agent and water, the first reduction agent is highly mixed with one or more kinds of organic solvents. The agent for hair deformation comprises the first reduction agent for hair deformation as a constituent component. The method for hair deformation comprises using the agent for hair deformation.COPYRIGHT: (C)2006,JPO&NCIPI【課題】ロッドを使用しなくても、高温整髪用アイロンもしくはコテの熱により簡単に半永久的に持続する毛髪変形が可能な毛髪変形用還元1剤、該毛髪変形用還元1剤を構成成分とする毛髪変形剤および該毛髪変形剤を使用した毛髪変形方法の提供。【解決手段】少なくとも還元剤、アルカリ剤および水を含有した毛髪変形用還元1剤において、1種もしくは2種以上の有機溶媒を高配合したことを特徴とする毛髪変形用還元1剤、該毛髪変形用還元1剤を構成成分とする毛髪変形剤および該毛髪変形剤を使用した毛髪変形方法。【選択図】図1