INATTENTION WARNING SYSTEM

A detection device configured to detect a viewing direction of a driver of a vehicle is provided. Viewing information is accumulated in a data accumulation unit. The viewing information includes a required viewing area and a required viewing time of the driver of the vehicle when the driver took a gaze off a road for a necessary visual check at each point where the vehicle travels. The viewing information accumulated in the data accumulation unit is acquired from the data accumulation unit. The warning generation unit does not generate the inattention warning when the viewing direction of the driver of the vehicle is directed toward the required viewing area for a current location of the vehicle for not more than the required viewing time for the current location of the vehicle.