PURPOSE: To make it possible to form a paint film with a constant film thickness regardless of the conveying speed of an article to be painted, by providing a painting gun, which is driven by a drive apparatus and moves at a constant speed apart from the movement of a moving platform, to said moving platform.

CONSTITUTION: A moving platform 6 is provided in a movable manner along a conveyor means 1 having a plurality of receivers 4, 5 as well as conveying an article 3 to be painted and plural hooks 9, 10 are provided to the moving platform 6 so as to be able to be selectively engaged with the receivers 4, 5 as well as to connect the conveyor means 1 and the moving platform 6 when they are engaged with the receivers 4, 5. In addition painting guns 30, 34 being provided to the moving platform 6 are driven by a drive apparatus 36 to be moved at a low speed apart from movement of the moving standard 6 while the moving platform 6 separated from the conveyor means 1 after painting is finished is returned to an original position by a cylinder 43.