1. A device for monitoring around a vehicle capable of detecting objects present around the vehicle based on an image captured by at least one infrared camera member provided with said vehicle, said device comprising: a binary object extraction unit which subjects a gray scale image of said image captured by said infrared camera member to a binary thresholding method, and extracts a binary object from said gray scale image; a gray scale object extraction unit which extracts a gray scale object, a range of said gray scale object including said binary object, from said gray scale image based on change in luminance of said gray scale image, and a pedestrian determination unit which sets a search area in an area including said gray scale object, and recognizes a pedestrian in said gray scale image based on a luminance dispersion in said search area.