Provided is a hair oil that excels in effects such as smooth spreading during application to impart to the hair a supple and light finish, a moisturized feeling, easy of styling, and luster. The hair oil contains an oil-based gel composition consisting of a gel-forming agent and an oil phase component, wherein the hair oil is characterized in that the gel-forming agent contains at least one selected from polyglycerin and polyglycerin fatty acid esters in an amount between 5 and 100 wt% (total amount) per 100 wt% of lecithin; the degree of polymerization of the polyglycerin is between 2 and 20; the polyglycerin fatty acid ester comprises fatty acid residues having 14 or fewer carbons; the HLB as calculated using an organic conception diagram is 15 or greater; and the degree of polymerization is between 8 and 40.