PROBLEM TO BE SOLVED: To provide a method for producing a nutritive material including pupae of house flies.SOLUTION: The method for producing the nutritive material including the pupae of the house flies includes a step (1) for growing a plurality of adult insects of the house flies in the environment with a temperature of 18-35°C and a humidity of 50-80% to allow the adult insects to lay eggs, a step (2) for culturing the house flies from the hatching of the eggs to the turning into larvae at 20-35°C by preparing a culturing material, and seeding the eggs of the house flies on the culturing material at least containing soybeans and a milk product, a step (3) for allowing the larvae to eat the excrements of a pig at 20-35°C to decompose the excrements by putting the larvae on the excrements of the pig, having a thickness of 4-10 cm, and a step (4) for obtaining the nutritive material including the pupae of the house flies by collecting the pupae formed from the larvae after two to three days, and subjecting the pupae to hot water treatment and dehydration treatment. The pupae of the house flies containing rich proteins are obtained by the method only by spending about five to seven days, and are added to an animal feed.
