A horizontal adjustment-engagement member of an object detection device drives the horizontal rotation component to adjust a horizontal angle of a detection unit, and a vertical adjustment-engagement member drives the vertical rotation component to adjust a vertical angle of a detection unit. Solid-pictorial video signals used upon signal transmission are generated by using video signals outputted from the left and right video cameras with respect to a video signal outputted from the front video camera. The at least one power supply may supply a DC signal and an AC signal to the pair of electrodes during sorption of the ions.