PROBLEM TO BE SOLVED: To provide a driver mentality judging device for highly precisely judging the mental status of a driver.SOLUTION: This driver mentality judging device 1 for judging the mental status of a driver is provided with a preceding vehicle detection means 10 for detecting the existence of a preceding vehicle a traveling status detection means 11 for detecting the traveling status of its own vehicle and a driver mentality judging means 31 for judging the mental status of the driver based on the comparison of the traveling status of its own vehicle when the preceding vehicle is judged to exist with the traveling status of its own vehicle when the preceding vehicle is judged not to exist.COPYRIGHT: (C)2007,JPO&INPIT【課題】運転者の心理状態を高精度に判定する運転者心理判定装置を提供することを課題とする。【解決手段】運転者の心理状態を判定する運転者心理判定装置1であって、先行車の存在を検出する先行車検出手段10と、自車の走行状態を検出する走行状態検出手段11と、先行車が存在する場合の自車の走行状態と先行車が存在しない場合の自車の走行状態との比較に基づいて運転者の心理状態を判定する運転者心理判定手段31とを備えることを特徴とする。【選択図】図1