The invention provides an oil-fat composition for HEAT cooking capable of substantially reducing an increase in acid value thereof in HEAT cooking over a long period of time, a manufacturing method thereof and an acid-value increase inhibiter for the oil-fat composition for HEAT cooking. The oil-fat composition is characterized in that the oil-fat composition contains, by mass, 0.01-2% of polyglycerol fatty acid ester and the average degree of polymerization of the polyglycerol that constitutes the polyglycerol fatty acid ester is 12-40, and the hydroxyl value is below 180.