PROBLEM TO BE SOLVED: To provide a device for determining the degree of wakefulness, which appropriately learns a criteria value for determining the degree of wakefulness.SOLUTION: The device 200 for determining the degree of wakefulness of a driver driving a vehicle includes: a steering condition detection means 240 for detecting the drivers steering operation amount or steering force a counter means for adding up the time elapsed in a condition where the drivers steering operation amount or steering force is equal to or less than a predetermined value a wakefulness degree decrease determining means 250 for determining that the degree of wakefulness has decreased when the time elapsed is equal to or greater than a criteria value a criteria value learning means 260 for correcting the learning of the criteria value according to the drivers driving condition and a number-of-travel detection means 220 for detecting the number of times that ones own vehicle has traveled on a road on which it is now traveling. The criteria value learning means permits the learning of the criteria value to be corrected on the basis of the driving condition when the number of times that the vehicle has traveled is equal to or greater than a predetermined value.COPYRIGHT: (C)2010,JPO&INPIT【課題】覚醒度判定の判定値を適切に学習する覚醒度判定装置を提供する。【解決手段】車両を運転するドライバの覚醒度を判定する覚醒度判定装置200を、ドライバの操舵操作量又は操舵力を検出する操舵状態検出手段240と、ドライバの操舵操作量又は操舵力が所定値以下である状態の経過時間を加算するカウンタ手段と、経過時間が判定値以上となったときに覚醒度低下を判定する覚醒度低下判定手段250と、ドライバの運転状態に基づいて判定値の学習補正を行う判定値学習手段260と、自車両が走行中の道路を自車両が過去に走行した走行回数を検出する走行回数検出手段220とを備え、判定値学習手段は、走行回数が所定値以上であるときに運転状態に基づく判定値の学習補正を許可する構成とする。【選択図】図1
