The purpose of the present invention is to provide an object detection device which is capable of accurately estimating the height of a road surface and is capable of reliably detecting an object present on the road surface. This object detection device 1 detects objects upon a road surface, and is equipped with: a stereo camera 110 for capturing images of the road surface 101a and the road shoulder 101b and generating image data; a three-dimensional data generation unit 210 for calculating disparity data for the pixels in the image data; a shoulder structure detection unit 310 for using the disparity data and/or the image data to detect shoulder structures; a structure ground-contact position derivation unit 410 for deriving the ground-contact position of a shoulder structure; a road surface position estimation unit 510 for estimating the height of the road surface 101a from the ground-contact position of the shoulder structure; and an object detection unit 610 for detecting an object 105 upon the road surface 101a by using the disparity data and the road surface height to separate disparity data corresponding to the road surface 101a and disparity data for the object.