Disclosed are a cognitive function improvement agent comprising vitamin A, vitamin B components (B 1 , B 2 , B 6 , and B 12 ), vitamin C, vitamin D, vitamin E, zinc, magnesium, pantothenic acid, biotin, and folic acid as active ingredients, and a method for improving cognitive functions, comprising administering vitamin A, vitamin B components (B 1 , B 2 , B 6 , and B 12 ), vitamin C, vitamin D, vitamin E, zinc, magnesium, pantothenic acid, biotin, and folic acid to a mammal.