PURPOSE: To eliminate the interference between the following robot main bodies and to facilitate the control by providing the first robot main body for opening the door of a work right above or obliquely above a conveyor and furnishing the second working robot main body on the side of a floor surface.

CONSTITUTION: A robot main body 7 for opening a door 5 is provided right above a conveyor 6 of a locker 1, similar robot main bodies 8 are provided above both side parts of the conveyor 6, and robot man bodies 9 for coating are provided on both sides of a floor surface of the conveyor 6. Consequently, the space around the conveyor can be effectively utilized, the interference between both robot main bodies is eliminated and the control can be facilitated.