To efficiently wash a crawler and collect washing dregs into a collecting box efficiently.

In a crawler washing device in which a pair of scraping plates 2a, 2b constructed of left and right vertical side faces 5a, 5b and a horizontal flat supporting face 6 connecting the lower ends of the vertical side faces together are arranged in parallel, an interval regulating means 7, which changes and regulates a lateral directional interval between the pair of scraping plates 2a, 2b, and a discharge hole 6a for washing dregs, which is arranged along only the side edge on the inside or along only the side edge on the outside in each of the scraping plates 2a, 2b, are arranged.