THREE-DIMENSIONAL OBJECT DETECTION DEVICE

A three-dimensional object detection device comprises three-dimensional object detection units (33, 37) for detecting three-dimensional objects based on image information of the rear of a vehicle from a camera (10), a natural object assessment unit (38) for assessing that a detected three-dimensional object is a natural object (Q1) including plants or snow based on an irregularity evaluation value calculated based on a first pixel number of first pixels representing a first predetermined differential in the differential image containing the detected three-dimensional object and a second pixel number of second pixels corresponding to the three-dimensional object and representing a second predetermined differential greater than the first predetermined differential, and a control unit (39) for controlling the various processes; the control unit (39) suppressing the assessment that the detected three-dimensional object is another vehicle (VX) when the detected three-dimensional object is assessed by the natural object assessment unit (38) to be a natural object (Q1).