A three-dimensional object detection has an image capturing device, a three-dimensional object detection unit, a high-luminance area assessment unit and a controller. The image capturing device captures images of an area including a right-side detection area or a left-side detection area rearward of a vehicle. The three-dimensional object detection unit detects a three-dimensional object based on the images acquired by the image capturing device. The high-luminance area assessment unit accesses a first detection area including a high-luminance area complying with a predetermined reference on either the right-side detection area or the left-side detection area. The controller suppresses detection of the three-dimensional object based on image information of the first detection area that was detected, and maintains or promotes detection of the three-dimensional object based on image information of a second detection area other than the first detection area within the right-side detection area or the left-side detection area.