A bath oil composition comprises (A) an essential oil and/or a component originating in an essential oil having a specific gravity of less than 1.0 and (B) an oleaginous component compatible with the component (A). The oleaginous component (B) has a specific gravity of 1.0 or more and the oleaginous component mixture consisting of the component (A) and the component (B) has such a specific gravity as to allow the uniform dispersion of the mixture in the bathwater as a whole. The component (A) is employed in such an amount as to give the concentration thereof in the bathwater of at least 2.0 ppm. Thus, the essential oils can well adhere to the skin and exert enhanced effects thereof on the skin surface, which might enable the percutaneous absorption of the essential oils so as to establish their effects in vivo. The composition is excellent also from the viewpoints of safety for the human body and the prevention of water pollution caused by drainage.