PROBLEM TO BE SOLVED: To provide a method for producing feed allowing cooked natto soybeans to be used as raw materials of the feed.SOLUTION: The method for producing the feed by collecting cooked natto soybeans and using the cooked natto soybeans as raw materials includes: collecting steps (steps 11 and 12) for collecting heat-treated cooked natto soybeans in an anaerobic state; and a feed-making step (a step 21) for making the feed of the cooked natto soybeans collected in the collecting steps by lactic-acid fermentation.