An oil composition contains 1 to 50 percent by weight of a glycerol monoether compound represented by following Formula (1): R1O—(C3H6O2)n1—H  (1) wherein R1 represents an alkyl or alkenyl group which may be substituted, and “n1” denotes a number of repeating glycerol units ranging from 1 to 3; and 1 to 50 percent by weight of a polyglycerol monoether compound represented by following Formula (2): R2O—(C3H6O2)n2—H  (2) wherein R2 represents an alkyl or alkenyl group which may be substituted, and “n2” denotes a number of repeating glycerol units ranging from 4 to 20. The oil composition is usable as a foamable cleansing agent that is mild to the skin, exhibits superior detergency for removing oily cosmetics, and is usable even when the skin is wet.