PROBLEM TO BE SOLVED: To reduce noise detection during determination of a vigilance level.SOLUTION: A vigilance level reduction alarm device 1 includes: a vigilance level detection part 12 which detects a vigilance level of a driver an alarm output part 13 which outputs alarm sound when the result of detection by the vigilance level detection part 12 exceeds or is equal to a prescribed threshold a driving environment detection part 10 which detects a driving environment of a vehicle and a threshold change part 11 which raises the threshold based on the result of detection by the running environment detection part 10.COPYRIGHT: (C)2012,JPO&INPIT【課題】覚醒度判定におけるノイズの検出を低減させること。【解決手段】運転者の覚醒度を検出する覚醒度検出部12と、覚醒度検出部12の検出結果が所定の閾値以上、または所定の閾値を超えたときには警報を出力する警報出力部13と、を有する覚醒度低下警報装置1において、車両の走行環境を検出する走行環境検出部10と、走行環境検出部10の検出結果に応じて閾値を引き上げる閾値変更部11と、を有するようにする。【選択図】図1
