A human fatigue assessment device capable of performing highly accurate fatigue assessment is provided. The human fatigue assessment device includes: a physiological signal measuring unit configured to measure a heartbeat or pulse wave of a user as a physiological signal a feature value extracting unit configured to extract feature values each indicating amount of parasympathetic nerve activity and each obtained from the measured physiological signal measured a storage unit in which the extracted feature values are stored and a fatigue type determining unit configured to determine a type of fatigue of the user as to whether the fatigue of the user is due to a first work or due to a second work more monotonous than the first work, using the extracted feature values.
