This vicinity monitoring device (10) is provided with a warning region setting unit (120) and a warning unit (140). In accordance with the traveling conditions of a dump truck (1), the warning region setting unit (120) sets a warning region in which it is necessary to warn a driver of the presence of an obstacle. The warning unit (140) warns the driver that the relative position of an obstacle detected by at least one radar device among eight radar devices (21-28) is positioned within the warning region.
