Abstract: A sleepiness level prediction device includes a vehicle information acquisition unit, a driver information acquisition unit, and a control unit. The vehicle information acquisition unit is configured to acquire information relating to a vehicle. The driver information acquisition unit is configured to acquire information relating to a driver. The control unit is configured to calculate a stimulus amount to be given to the driver based on a current driving load of the driver and a driving load after a prescribed time, based on the information relating to the vehicle, calculate a non-acclimation degree indicative of a level at which the driver is not acclimated to driving based on a change in the stimulus amount, and predict a sleepiness level of the driver after the prescribed time based on a current sleepiness level of the driver estimated based on the information relating to the driver and the non-acclimation degree.

Abstract: A sleepiness level prediction device (1) according to one embodiment of the present invention is provided with: a vehicle information acquisition unit (10) that acquires information regarding a vehicle; a driver information acquisition unit (20) that acquires information regarding a driver; and a control unit (40) that calculates, on the basis of the acquired information regarding the vehicle, a stimulus quantity (S) provided to the driver on the basis of the driver's present driving load and the driving load after a predetermined time period, that calculates a non-acclimation degree (H) indicating a degree to which the driver is not acclimated to driving, on the basis of a change (?S) of the calculated stimulus quantity (S), and that predicts a sleepiness level (D1) of the driver after a predetermined time period on the basis of the calculated non-acclimation degree (H) and the driver's present sleepiness level (D0) estimated on the basis of the acquired information regarding the driver.