Patent ID: 8866896

Claim:
A biological body state assessment device comprising: face information acquisition means for acquiring face information of a driver; eye open time variation calculation means for calculating variation in an eye open time of the driver based on the face information of the driver; face direction variation calculation means for calculating variation in a face direction of the driver based on the face information of the driver; vigilance assessment means for assessing vigilance of the driver based on the variation in the eye open time of the driver and the variation in the face direction of the driver; and drowsiness occurrence assessment means for assessing a possibility of drowsiness occurring in the driver based on an increase or a decrease in the variation in the eye open time of the driver after an absentminded state of the driver has been detected from the vigilance of the driver assessed by the vigilance assessment means, wherein the variation in the eye open time is a standard deviation of the eye open time or a dispersion of the eye open time, and wherein the variation in the face direction is a standard deviation of the face direction or a dispersion of the face direction.