PROBLEM TO BE SOLVED: To provide an oxidation hair dye composition having good spreadability on the hair and excellent usability in application, preventing the damage of the hair in application to impart the dyed hair with excellent finger combing property and natural luster and having excellent leveled dyeing property of the hair.SOLUTION: The oxidation hair dye composition contains (a) a polyoxyethylene hardened caster oil, (b) a hydrocarbon, preferably a hydrocarbon taking solid state at room temperature and (c) a quaternary ammonium salt expressed by general formula 1 (R1CO is a branched fatty acid residue or lanolin fatty acid residue R2 to R4 are each a 1-3C alkyl n is 2 or 3 and X- is a halogen ion, methylsulfate ion or ethylsulfate ion).COPYRIGHT: (C)2008,JPO&INPIT【課題】施術の際には毛髪上での延びがよく使用性に優れ、施術中の毛髪の損傷を防止して染毛後の毛髪に優れた指どおり性と毛髪本来の自然な艶を付与し、しかも毛髪の均染性にも優れる酸化染毛剤組成物を提供すること。【解決手段】(a)ポリオキシエチレン硬化ヒマシ油、(b)炭化水素類、好ましくは室温で固形の炭化水素類、及び(c)下記一般式1で表される四級アンモニウム塩を含有してなる酸化染毛剤組成物とする。【選択図】なし