Abstract: A hair cosmetic composition comprising:(A) 0.05% to 10% by weight of at least one quaternary ammonium salt having the formula: ##STR1## wherein R.sub.1 is an alkenyl having 14 to 20 carbon atoms, R.sub.2 is an alkyl or alkenyl having 14 to 20 carbon atoms, R.sub.3 and R.sub.4 are independently methyl, ethyl, a polyoxyethylene having an average polymerization degree of 1 to 5, or a polyoxypropylene having an average polymerization degree of 1 to 5, and X.sup.- is an anion, and having an iodine value of 35 to 100; and(B) 0.05% to 10% by weight of a phosphate having the formula: ##STR2## wherein R.sub.5 is a linear alkyl having 1 to 22 carbon atoms, a hydroxyalkyl having 1 to 22 carbon atoms, an alkenyl having 2 to 22 carbon atoms, an alkylphenyl having 7 to 22 carbon atoms, or glyceryl, R.sub.6 is hydrogen or methyl, R.sub.7 is hydrogen, an alkali metal, a C.sub.1 -C.sub.20 alkyl-substituted ammonium, or a C.sub.1 -C.sub.20 hydroxyalkyl-substituted ammonium, R.sub.8 is a group having the formula ##STR3## or R.