PURPOSE: To accurately draw a white line at the prescribed position and prevent a spray paint from being scattered to stain a coat by fitting a spray device at the side section of a carriage, and arranging the upper end edge of guiding square plates above a spray nozzle.

CONSTITUTION: An electric pump 17 is mounted on a carriage 10 having a handle 13 at one end and driven by a motor. A paint tank 15 connected to the suction port of the electric pump 17 via an inlet side pipe 18 is mounted. An injection device 20 connected to the discharge port of the electric pump 17 via an outlet side pipe 19 is mounted. The jetting device 20 is arranged with an jet nozzle jetting a paint in a spray shape and a pair of guiding square plates suspended in parallel with each other on the sides of the jet nozzle. The distances of them in the horizontal direction are made equal, and the horizontal positions of the upper end edges of the guiding square plates are arranged above the jet nozzle.