Disclosed herein is an oil composition comprising the following components (A) and (B):(A) 15 to 70% by weight of diglycerides in which less than 15% by weight of the constitutive fatty acids are (3 type unsaturated fatty acids; and (B) 30 to 85% by weight of a triglyceride in which at least 15% by weight of the constitutive fatty acids are (3 type unsaturated fatty acids. The oil composition is good in flavor, hard to be colored, excellent in hydrolytic stability and resistance to oxidation, good in emulsion stability and excellent in intake balance among fatty acids even under severe conditions that heating is performed at a high temperature for a long period of time, can be widely developed to medicinal preparations and foods and moreover exhibit an excellent inhibitory effect on accumulation of body fat by ingestion of a small amount of diglycerides.