To provide an atopic dermatitis assessment method which allows for non-invasively, simply, and appropriately assessing atopic dermatitis-related skin condition.SOLUTION: An atopic dermatitis-related skin condition assessment method disclosed herein uses acetone concentration in gas volatilizing from a skin surface of a subject as an indicator to assess atopic dermatitis-related skin condition of the subject.SELECTED DRAWING: Figure 1【課題】アトピー性皮膚炎に関係する肌状態を非侵襲的に、簡便かつ的確に評価する、アトピー性皮膚炎の評価方法を提供する。【解決手段】被験体の皮膚表面から揮散するガス中のアセトン量を指標として、被験体のアトピー性皮膚炎に関係する肌状態を評価する、アトピー性皮膚炎に関係する肌状態の評価方法。【選択図】図1