To provide a crawler type traveling device of a working vehicle which smoothly performs scraping-off of mud adhered to a side wall or the like of a transmission case by loosely fitting a scraper wheel having a plurality of scraper pieces into a support member, contacting to the crawler, and driving to rotate.

The crawler 12 is wound around a drive sprocket 15 provided on the right and left axles 21 supported on the transmission case 13, and a driven wheel 16 supported on a track frame 4. A scraper wheel 2 having a plurality of projected scraper piece 2b on a boss part 2a is loosely fitted into the support member 20, the crawler 12 is contacted to the boss part 2a, and the scraper wheel 2 is driven to rotate within a crawler disposition clearance 22 formed between the side wall of the transmission case 13 and the inner side end of the crawler 12.