Provided is a hair cosmetic composition, which contains the following components (A) and (B):(A) a hydroxy-free tricarboxylic acid having from 4 to 20 carbon atoms in total, or salt thereof, and (B) at least one or more organic solvents selected from the group consisting of aromatic alcohols, N-alkylpyrrolidones, alkylene carbonates, polypropylene glycols, lactones and cyclic ketones, wherein the organic solvent has a ClogP of from -2 to 3; and wherein the hair cosmetic composition has a pH of from 2 to 5 at 25.degree. C. when diluted to 20 times the weight with water. Provided also is a hair quality improving method which comprises treating the hair with the hair cosmetic composition.The hair cosmetic composition of the present invention can for example give strength/body, manageability, and set retention property to the hair which is apt to be dry and moistureless owing to the damage by coloring, permanent waving, or repetition of excessive blow drying.