1. An image processing device for a vehicle, comprising: an object detecting means for transmitting a radio wave outside of the vehicle and detecting an object in a first area outside of the vehicle by using a reflected wave of the transmitted radio wave; an image acquisition means for acquiring an image in a second area including the first area; an image processing means for processing the acquired image to detect, in the acquired image, the object detected by the object detecting means; and a visibility detecting means for detecting visibility outside of the vehicle based on result of detection of the object detecting means and result of detection of the image processing means.