A fatigue-degree monitoring device includes a first-fatigue-indicator calculating section configured to calculate a first indicator concerning fatigue of a user on the basis of operation from an operation section, a second-fatigue-indicator calculating section configured to calculate a second indicator concerning the fatigue of the user on the basis of biological information of the user, and a fatigue determining section configured to determine a fatigue degree of the user on the basis of the first indicator and the second indicator.
