PROBLEM TO BE SOLVED: To provide a skin internal structure or a skin color unevenness evaluation method, which can be applied to skin counseling in a cosmetic selling space or an esthetic method, for estimating or evaluating the internal structure of the skin or the color unevenness of the skin.SOLUTION: The provision is achieved by measuring the light diffusion of a skin surface, by estimating the internal structure of the skin on the basis of the measurement result, and by evaluating the color unevenness of the skin.
