A driving support device uses a camera mounted on a vehicle for imaging a blind spot area created by a pillar of the vehicle and displays an image taken by the camera on the interior surface of the pillar. A virtual plane passing through boundaries of the blind spot area is set, and an image plane of the camera is set at a predetermined position where a non-displayed area or an excess area, created by deviation between the virtual plane and the image plane of the camera, is reduced. Image data input from the camera is subjected to coordinate transformation on the virtual plane, and an image corresponding to the blind spot area created by the pillar is displayed on the interior surface of the pillar, based on the image data subjected to coordinate transformation on the virtual plane.