A dimple position detection device for detecting a position of a dimple formed on a load beam is provided with an illumination device, imaging device, and image processing section. The illumination device directs illumination light toward the dimple. The imaging device receives reflected light from the dimple. The image processing section binarizes an image obtained by the imaging device. The image processing section maximizes a binarization level, binarizes the reflected light image, determines whether an area of a light spot region or on-region above the binarization level has a predetermined value, reduces the binarization level when the area of the light spot region is less than the predetermined value, and calculates the gravitational position of the light spot region with the predetermined value reached by the light spot region area.