To provide a travel support system and an on-vehicle device capable of reducing confusion of drivers of nearby vehicles due to travel of a vehicle in which a driver's abnormality is detected.SOLUTION: A travel support system includes: an own vehicle abnormality response part 200a comprising a driver state estimation part 201a for estimating the state of a driver of an abnormal vehicle, a surrounding area warning part 202a for transmitting a warning signal toward the periphery of the abnormal vehicle when the driver state estimation part 201a estimates a driver's abnormality, and a stimulus control part 203a for stimulating the driver of the abnormal vehicle； and an other vehicle abnormality response part comprising a notification part for notifying the driver of the own vehicle of an abnormality of the driver of the abnormal vehicle when receiving the warning signal transmitted from the abnormal vehicle, and a stimulus request part for transmitting a stimulus request signal to the abnormal vehicle in response to acceptance of the stimulus request input by an air conditioner panel of the own vehicle.SELECTED DRAWING: Figure 3【課題】ドライバの異常が検出される車両の走行による周辺車両のドライバの困惑を抑えることを可能にする走行支援システム及び車載装置を提供する。【解決手段】走行支援システムは、異常車両のドライバの状態を推定するドライバ状態推定部２０１ａと、ドライバ状態推定部２０１ａでドライバの異常を推定した場合に、異常車両の周辺に向けて警告信号を送信させる周辺警告部２０２ａと、異常車両のドライバに対して刺激を行わせる刺激制御部２０３ａとを備える自車異常対応部２００ａと、異常車両から送信される警告信号を受信した場合に、異常車両のドライバの異常を自車のドライバに通知する通知部と、自車のエアコンパネルで刺激要求入力を受け付けることに応じて刺激要求信号を異常車両に向けて送信させる刺激要求部とを備える他車異常対応部とを備える。【選択図】図３
