PROBLEM TO BE SOLVED: To provide a non-oxidative hair dyeing agent having excellent storage stability compared with conventional non-oxidative hair dyeing agents.SOLUTION: A hair dyeing agent comprises a first agent that comprises a material that reacts with iron to develop color and fills a container, and a second agent that comprises iron salt and fills a container, where at least the container of the first agent has 2000 ml/m2 24hr atm or less of oxygen permeability at temperature 20°C and relative humidity 90% measured in accordance with JIS K7126.COPYRIGHT: (C)2015,JPO&INPIT【課題】従来の非酸化型の染毛剤に比して保存安定性に優れる非酸化型の染毛剤の提供。【解決手段】鉄と反応して発色する物質を含有し容器に充填される第1剤と、鉄塩を含有し容器に充填される第2剤とを含み、かつ、少なくとも第1剤における容器の、JIS K7126に準拠して測定した温度20℃、相対湿度90%における酸素透過度が2000ml/m2・24hr・atm以下である染毛剤。【選択図】なし
