The automated driving control unit 7 of the automated driving system 2 can previously detect presence of an obstacle on the scheduled travel course through radio communication with the outside such as vehicle-to-vehicle communication and road-to-vehicle communication described above even in a case that the obstacle cannot be viewed as being behind a building or the like during automated driving on a curved road. FIGS. 18A and 18B schematically illustrate a screen of prior notice displayed respectively at the first and second display devices 3, 4 in advance in a case that lane change is to be performed from the cruising lane 37, 37′ to the overtaking lane 60, 60′ to avoid such an obstacle.