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 1;COPYRIGHT: (C)2019,JPO&INPIT
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