PROBLEM TO BE SOLVED: To provide a method for producing a starch processed product effectively suppressed in quality deterioration by aging and biodegradation, and to provide the resultant starch processed product. SOLUTION: The method for producing the starch processed product comprises the following practice: At least one kind of powder selected from starch and its split product andε-poly-L-lysine and/or its salt are mixed together and then heated, or homogeneously mixed in a dissolved state and then, as necessary, heat-treated to a prescribed temperature or higher. The starch processed product thus obtained is provided. COPYRIGHT: (C)2006,JPO&NCIPI