PROBLEM TO BE SOLVED: To provide a hair coloring agent for hiding a gray hair which has a natural blackness and a color familiar to the hair, has an excellent adhesive property to the hair, does not have stickiness nor result in color staining, and further has excellent stability over time at the time of finishing.SOLUTION: A hair coloring agent for hiding a gray hair is characterized by containing melanin derived from Sepia officinalis, a cationic detergent, and a film-forming ingredient.COPYRIGHT: (C)2015,JPO&INPIT【課題】毛髪に対する自然な黒さ、色なじみを有し、毛髪に対する付着性にも優れ、また仕上がり時のべたつきや色移りがなく、さらには経時安定性にも優れた白髪隠し用の毛髪着色料を提供すること。【解決手段】イカスミ由来メラニン、カチオン性界面活性剤、皮膜形成剤を含有することを特徴とする白髪隠し用の毛髪着色料。【選択図】なし