In FIG. 2, each of the mounting machines M1 to M3 includes a component mounting unit 6, and component supplying units 7 that are provided on both sides of the component mounting unit 6. The respective units are covered with a cover member 8. In FIG. 2, a direction perpendicular to the sheet is defined as an X direction, and a direction perpendicular to the X direction on a horizontal plane is defined as a Y direction. The component mounting unit 6 includes a substrate transporting mechanism 10 including a pair of transport conveyers which is provided on a base 9 and extends in the X direction, and a mounting head 11 that can move in the X direction and the Y direction above the substrate transporting mechanism 10. The substrate transporting mechanism 10 transports a substrate 12, and positions the substrate 12 in a predetermined mounting operation position. The mounting head 11 includes a suction nozzle 11a that can suction the component, and picks up the component supplied from the component supplying unit 7 and mounts the picked-up component on the substrate 12 by the suction nozzle 11a.