PROBLEM TO BE SOLVED: To suppress erroneous detection of an arousal state of an occupant when a vehicle travels on a flat road and vibration of the vehicle is small, and appropriately determine the arousal state of the occupant.SOLUTION: An occupant state determination device 100 includes: a vehicle acceleration acquisition unit 10 for acquiring acceleration of a vehicle an occupant acceleration acquisition unit 20 for acquiring acceleration of an upper half body of an occupant of the vehicle a vehicle acceleration determination unit 30 for determining whether acceleration acquired by the vehicle acceleration acquisition unit is equal to or greater than a prescribed threshold value or not a correlation calculation unit 50 for calculating correlation between the acceleration acquired by the vehicle acceleration acquisition unit and the acceleration acquired by the occupant acceleration acquisition unit and an occupant state determination unit 40 for determining arousal degree of the occupant on the basis of determination performed by the vehicle acceleration determination unit and the correlation calculated by the correlation calculation unit.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】 車両が平らな道路を走行し車両の振動が小さい場合に乗員の覚醒度の状態を誤判定することを抑制し、乗員の覚醒度の状態を的確に判定する。【解決手段】 車両の加速度を取得する車両加速度取得部10と、車両の乗員の上半身の加速度を取得する乗員加速度取得部20と、車両加速度取得部が取得した加速度が所定の閾値以上か否かの判定を行う車両加速度判定部30と、車両加速度取得部が取得した加速度と乗員加速度取得部が取得した加速度の相関を演算する相関演算部50と、車両加速度判定部が行った判定と相関演算部が演算した相関に基づいて乗員の覚醒度を判定する乗員状態判定部40と、を備える乗員状態判定装置100を提供する。【選択図】 図3
