A vicinity supervising device includes an image capturing unit that captures a plurality of images in which an object is simultaneously captured from different locations; a matching processing unit that calculates a parallax point and a reliability point, the parallax point being the number of pixel regions from which a parallax is calculated among a plurality of pixel regions divided by the plurality of images, and the reliability point being the number of pixel regions having high recognition reliability among the plurality of pixel regions; and an evaluation unit that evaluates, based on the parallax point and the reliability point, an imaging environment where the plurality of images are captured.