APPROACHING VEHICLE DETECTION DEVICE

An approaching vehicle detection device includes an approaching vehicle detection unit 22 that detects an approaching vehicle based on a running noise, an acquisition unit (an illumination sensor 10 and a weather information acquisition device 11) that acquires visibility information which indicates a visibility around the vehicle, and a determination unit (operation determination unit 21A) that determines whether or not to cause the approaching vehicle detection unit 22 to operate based on the visibility information acquired by the acquisition unit.