To automatically stop a traveling working vehicle at a prescribed position by constituting a traveling working vehicle of an alternate operation device between a traveling clutch and a brake, an automatic stop device composed of a bush rod releasing the connection of the traveling clutch and operating the brake, and an operation release lever freely holding/releasing the operation state of the automatic stop device.

A stopper plate on which the tip 40a of a bush rod abuts is provided beforehand in a prescribed stop position of a crawler sprayer. When the crawler sprayer is self traveled and the tip 40a of the bush rod 40 abuts on the stopper plate, the bush rod 40 is slid to the rear of the machine body and the tip 48a of an operation lever 48 is moved frontward. An operation release lever 50 provided in the top 48b of the operation lever 48 moves the top 33a of an erection bracket 33 to the rear of the machine body 2. As a result, a handle main body 10 is rotationally moved to the rear of the machine body, the connection of the traveling clutch is released by an alternate operation device, and a brake is operated, thereby stopping the machine completely.