PROBLEM TO BE SOLVED: To provide an evaluation method capable of easily, objectively and highly accurately evaluating looseness of facial skin. SOLUTION: A first three-dimensional face shape data of an evaluation target person's face is acquired, and a first three-dimensional ideal face shape data without slack is generated based on the evaluation target person's face, and a first one. A model that calculates the difference between the three-dimensional face shape data and the first three-dimensional ideal face shape data as the first feature amount for evaluating the slack of the face of the evaluation target person, and evaluates the slack of the face created in advance. It is a method of calculating a slack index value based on the first feature amount and evaluating the slack of the face of the evaluation target person based on the slack index value. The model was acquired from the faces of each of a plurality of subjects. Second three-dimensional face shape data, second three-dimensional ideal face shape data without slack created based on the faces of each of the plurality of subjects, and a visual evaluation value of slack of each of the faces of the plurality of subjects. Provided is a slack evaluation method created based on. [Selection diagram] Fig. 1【課題】顔肌の弛みを容易に、客観的に、且つ、高精度に評価することができる評価方法を提供する。【解決手段】評価対象者の顔の第１の三次元顔形状データを取得し、評価対象者の顔に基づいて、弛みのない第１の三次元理想顔形状データを生成し、第１の三次元顔形状データと第１の三次元理想顔形状データとの差分を評価対象者の顔の弛みを評価する第１の特徴量として算出し、予め作成された顔の弛みを評価するモデルと第１の特徴量に基づいて、弛み指標値を算出し、弛み指標値に基づいて、評価対象者の顔の弛みを評価する方法であって、モデルは、複数の被験者それぞれの顔から取得した第２の三次元顔形状データ、複数の被験者それぞれの顔に基づいて作成された、複数の弛みのない第２の三次元理想顔形状データ、及び複数の被験者それぞれの顔の弛みの目視評価値に基づいて作成されたものである弛み評価方法を提供する。【選択図】図１
