An objective to be achieved by the present invention is to provide a method for producing a heat processed food which can be uniformly heated in a short time without causing “unevenness of heating” on microwave oven cooking. Another objective of the present invention is also to provide a heat professed food, use of an antifreeze protein in producing a heat processed food, a method for improving an effect of heating treatment on a heat professed food, and an agent for improving an effect of heating treatment. The method for producing a heat processed food according to the present invention is characterized in comprising the steps of adding an antifreeze protein to a food material or a food； and cooling the resulting mixture.
