To provide a composition having imidazole dipeptide which is effective for improving mild cognitive impairment as a main component.SOLUTION: A composition for improving mild cognitive impairment which has imidazole dipeptide separated and purified from chicken meat extract or salmon extract as a main component, in which the imidazole dipeptide does not contain organism-derived impurity, 75% or more is anserine in the case of imidazole dipeptide derived from the chicken meat extract, and 95% or more is anserine in the case of imidazole dipeptide derived from the salmon extract.SELECTED DRAWING: Figure 1
