1. A vehicle periphery monitoring device comprising: an in-vehicle camera module photographing a peripheral area of a vehicle; a first bird's-eye view image generation section generating a first bird's-eye view image through a two-dimensional plane projective transformation based on a photographed image acquired by the in-vehicle camera module; a second bird's-eye view image generation section generating a second bird's-eye view image through a three-dimensional plane projective transformation based on the photographed image; a displaying image generation section generating a first displaying image for monitor displaying from the first bird's-eye view image and a second displaying image for monitor displaying having a higher displaying magnification than the first displaying image, from a predetermined area of the second bird's-eye view image corresponding to a predetermined area of the first displaying image; and wherein based on 3D object detection information received from a 3D object detection section detecting a 3D object in the vehicle periphery, the second displaying image including an area where the 3D object is present is displayed on the monitor.