To precisely determine suitability for driving by measuring a condition of various drivers in a wide range and in detail.SOLUTION: In the method and device of the present invention, biological fluctuation is measured in two types consisting of cardiac beat fluctuation and chaos fluctuation from brain waves of various drivers. On the basis of these two types of biological fluctuation, four conditions are presumed, including "adaptability deterioration/mental depression state", "drowsiness/fatigue state", "tension/exaltation state", and "stress state" which affect driving of various drivers.SELECTED DRAWING: Figure 2【課題】各種のドライバーの状態をより広範かつ詳細に測定して、運転に適した状態か否かを的確に判定する。【解決手段】この方法及び装置では、各種のドライバーの脈波から心拍ゆらぎ、カオスゆらぎの２種類の生体ゆらぎを計測し、この２種類の生体ゆらぎに基づいて、各種のドライバーの運転に支障を及ぼす「適応力低下・落込み状態」、「眠気・疲労状態」、「緊張・気分高揚状態」、「ストレス状態」の４つの状態を推定する。【選択図】図２
