1. A vehicle surroundings monitoring device comprising: a position mapping unit for carrying out a position mapping process of expressing a positional relationship in a detection range in surroundings of a vehicle of a detecting unit for detecting an obstacle by coordinates on a camera image captured by a camera unit having an image capture range in said surroundings of the vehicle; a mapping transformation unit for deriving transformation parameters used for carrying out a mapping transformation in such a way that said obstacle detected by said detecting unit is placed at a predetermined position on said camera image on which the position mapping process has been carried out by said position mapping unit; and a camera image transformation unit for carrying out an image transformation on said camera image by using the transformation parameters acquired by said mapping transformation unit in such a way that said obstacle is placed at said predetermined position.