According to a manufacturing method of the present invention, Class 2 food allergens can be decomposed even if a protease is not used, and thus a manufacturing cost is inexpensive, and a food composition having a reduced content of Class 2 food allergens can be provided without using salt water which has an effect on the taste. The fermented food composition, obtained by the manufacturing method of the present invention, has a sufficiently reduced content of the Class 2 food allergens, and thus even those who contracts pollinosis or latex allergy can safely take it. The fermented food composition is tasty, and thus it can be used instead of food having the Class 2 food allergens.
