Component mounting system, component sorting method, and component mounter

A component mounting system comprising:

• a plurality of component mounters, each component mounter including:
• a first board transport mechanism that transports, positions, and holds a board,
• a second board transport mechanism that transports, positions, and holds a board,
• a first mounting head that is disposed on a side of the first board transport mechanism and mounts components on the board,
• a second mounting head that is disposed on a side of the second board transport mechanism and mounts the components on the board,
• a plurality of carriages that are installed on the side of the first board transport mechanism, wherein installed on each carriage are a first plurality of component supply devices which supply the components, and
• a plurality of carriages that are installed on the side of the second board transport mechanism, wherein installed on each carriage are a second plurality of component supply devices,
• wherein when changing a production board type of any one of the boards transported by the first board transport mechanism and the second board transport mechanism, the components are supplied from the plurality of component supply devices held by a first carriage installed on the side of one of the board transport mechanisms that transports the board to be changed, and the plurality of component supply devices held by a second carriage and a third carriage installed on the side of another of the board transport mechanisms that transports the board not to be changed, and the components are mounted on the board that does not change the production board type by the first mounting head and the second mounting head.