<p>In the present invention, a vicinity monitoring device (10) is provided with: a monitor (50) that displays a birds-eye-view image (200) containing an image of a dump truck (1); a payload meter ECU (21) that detects the load quantity of the dump truck (1); and a controller (20) that switches the size of and displays on the monitor (50) a cargo image (C1) displayed as an image on the vessel (4) of the dump truck (1) on the basis of the detection results by the payload meter ECU (21).</p>
