A vehicle diagnosis robot of the invention comprises: an image taking unit (11) for taking an image of a portion of a vehicle to be inspected; an action generator (12) for generating an action required for the image taking unit to take an appropriate image of the portion of the vehicle; an information storage (14) for storing normal state information obtained from an image of the inspected portion of the vehicle in a normal state; means (17) for acquiring failure information by comparing current state information derived from a current image of the inspected portion of the vehicle taken by the image taking unit with the normal state information stored in the information storage; and information output means (15) for outputting the failure information acquired by the failure information acquiring means.