An apparatus for monitoring physical condition from body surface temperature, pulse rate, respiration, and blood oxygen concentration, a blood oxygen concentration measuring unit for measuring the blood oxygen concentration of the subject, and a body surface temperature for measuring the body surface temperature of the subject A measurement unit, a pulse measurement unit that measures the pulse of the subject, a respiratory rate measurement unit that measures the respiratory rate of the subject, and the data obtained by each of the measurement units are processed according to a predetermined processing method, A physical condition monitoring device comprising a calculation unit for calculating physical condition and a result display unit for displaying calculation results.体表面温度、脈拍、呼吸及び血中酸素濃度から体調をモニタリングする装置であって、被験者の血中酸素濃度を測定する血中酸素濃度計測部と、被験者の体表面温度を測定する体表面温度計測部と、被験者の脈拍を測定する脈拍計測部と、被験者の呼吸数を測定する呼吸数計測部と、上記各計測部で得られたデータを所定の処理方式に従って処理し、被験者の現在の体調を算出する演算部と、演算結果を表示する結果表示部とを具備する体調モニタリング装置。