An overlooking image generation system for a vehicle is provided to confirm the traffic situation around a subject vehicle. The system includes an overlooking image generation device that generates a wide-area overlooking image capable to confirm traveling situations of a subject vehicle and a nearby vehicle. A display device displays the wide-area overlooking image. The overlooking image generation device acquires captured image signals of other vehicles including a plurality of captured images by communicating with the other vehicles using V2X, generates the wide-area overlooking image including the subject vehicle and the nearby vehicle by image-synthesizing the acquired captured image signals of the other vehicles, and displays the generated wide-area overlooking image including the subject vehicle and the nearby vehicle on the display device.