There is provided a component mounting system including: a component mounting device group in which a plurality of component mounting devices that mount components supplied to a board transported in from an upstream side by a tape feeder and transport out the board to a downstream side, and cut a carrier tape after supplying the components by a cutter device and discharge scraps of carrier tape, are installed on a floor surface while being arranged in a direction of conveying the board; a main conveyor that is installed along an arrangement direction of the plurality of component mounting devices in a region on the floor surface under the component mounting device group, and transports the scraps of carrier tape discharged from each of the plurality of component mounting devices; and a scraps storage that is installed outside the region and stores the scraps of carrier tape transported by the main conveyor.