DRIVING SUPPORT DEVICE OF VEHICLE

To provide a driving support device of a vehicle that prevents the vehicle from deviating from a lane marking while executing a lane center maintenance function, and warns a driver of inattentitive driving or the like, more clearly.SOLUTION: A driving support device 1 comprises a control device 14 that performs lane center maintenance control on the basis of a travelling environment, an electric power steering device 35 that applies assist torque to turning angles of turning wheels 16R and 16L, and a driver monitoring system 31b that detects biological information about a driver. The control device 14 counts the number of times at which directions of driver's line of sight are different with respect to a target route direction of a vehicle M during execution of the lane center maintenance control, and when the counted number of time is above a predetermined threshold number of times, gradually reduces assist torque Ta of the electric power steering device 35 in accordance with increase in the counted number of times.SELECTED DRAWING: Figure 4 【課題】 車線中央維持機能を実行中に、車線区画線からの逸脱を防止し、より明確にドライバへの脇見運転などの注意を喚起する車両の運転支援装置の提供。【解決手段】 運転支援装置１は、走行環境に基づいて、車線中央維持制御を行う制御装置１４と、転舵輪１６Ｒ，１６Ｌの転舵角にアシストトルクを付与する電動パワーステアリング装置３５と、ドライバの生体情報を検出するドライバモニタリングシステム３１ｂと、を備え、制御装置１４は、車線中央維持制御を実行中に、車両Ｍの目標ルート方向に対してドライバの視線方向が異なる回数をカウントし、カウントの回数が所定の閾値回数以上となった場合、カウントの回数の増加に応じて電動パワーステアリング装置３５のアシストトルクＴａを段階的に低減させる。【選択図】図４