PROBLEM TO BE SOLVED: To provide a fatigue degree estimation device, a fatigue degree estimation system and a fatigue degree estimation method in which a mental fatigue degree of an examinee can be estimated from an ammonia concentration included in exhalation of the examinee.SOLUTION: A fatigue degree estimation device comprises: a concentration acquisition unit for acquiring data representing the expired ammonia concentration of an examinee detected by a gas sensor having a bromide first copper film where a resistance value is changed according to the concentration of ammonia gas included in exhalation a work amount acquisition unit for acquiring a work amount corresponding to the ammonia concentration acquired by the concentration acquisition unit from the data representing a relationship between the work amount and the concentration of the ammonia gas included in the exhalation and a fatigue degree estimation unit for acquiring a mental fatigue degree corresponding to the work amount acquired by the work amount acquisition unit as an estimate value of the mental fatigue degree from the data representing the relationship between the work amount and the mental fatigue degree.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2019,JPO&INPIT【課題】被検者の呼気に含まれるアンモニア濃度から、被検者の精神的な疲労度を推定することができる、疲労度推定装置、疲労度推定システム、及び、疲労度推定方法を提供する。【解決手段】疲労度推定装置は、呼気に含まれるアンモニアガスの濃度に応じて抵抗値が変化する臭化第一銅膜を有するガスセンサによって検出される被検者の呼気のアンモニア濃度を表すデータを取得する濃度取得部と、作業量と呼気に含まれるアンモニアガスの濃度との関係を表すデータから、前記濃度取得部によって取得されたアンモニア濃度に対応する作業量を取得する作業量取得部と、作業量と精神的な疲労度との関係を表すデータから、前記作業量取得部によって取得された作業量に対応する精神的な疲労度を精神的な疲労度の推定値として取得する疲労度推定部とを含む。【選択図】図1
