Patent ID: 8791825

Claim:
A biological state determination device which is mounted in a vehicle and determines a biological state of a driver, the biological state determination device comprising: a plurality of state estimation units configured to estimate a driver biological state, which is the biological state of the driver, on the basis of information representing the biological state of the driver; a weight setting unit configured to set a weight for each driver biological state on the basis of information representing the level of possibility of erroneously estimating the driver biological state obtained on the basis of the information representing the biological state of the driver; a weighting unit configured to weight a plurality of driver biological states using the weight set by the weight setting unit; and a state determination unit configured to determine the presence/absence of abnormality in the biological state of the driver on the basis of a plurality of driver biological states weighted by the weighting unit, wherein the state estimation unit estimates the presence/absence of sleepiness in the driver as the biological state of the driver, and the state determination unit determines, as an abnormality, a state where the driver feels sleepiness, and wherein, until a predetermined time set in advance elapses from the start of driving, the weight setting unit sets the weight on the basis of the ratio of the time for which the state estimation unit estimates that the driver feels sleepiness with respect to the predetermined time.