PURPOSE: To easily change coating thickness even during paint coating work for a road surface.

CONSTITUTION: When the positions of the angles of revolution of a pair of revolving members 76 are altered according to the operation of a film thickness operation apparatus 100, the relative position of a movable plate 80 and a paint container 28 in a height direction is changed in relation to the alteration of the angle-of-revolution positions of the revolving members 76. Since the gap between the slide edge of the bottom part of the paint container 28 and a road surface 36 is changed, the film thickness T of the paint 42 for the road surface applied on the road surface 36 is newly set. When the coating film thickness T of the paint 42 for the road surface is changed, it is unnecessary to allow the paint coating apparatus 10 to fall or to detach a glass beads scattering device 30 from a vehicle body.