A board work system including multiple work machines (12, 14) arranged in a line which each include a conveyance device that conveys a circuit board, a mounting head that performs work of mounting electronic components with respect to a circuit board, a moving device that moves the mounting head to any position, and a component supply device which includes a feeder loading section on which at least one feeder which supplies electronic components is detachably loaded, and supplies the electronic components to a supply position of the electronic components of the at least one feeder, wherein a circuit board is conveyed from the work machine arranged upstream to the work machine arranged downstream in the multiple work machines (12, 14), and work is performed with respect to the circuit board by sequentially performing work with respect to the circuit board at each of the multiple work machines (12, 14), the board work system comprising: a transfer device that transfers the feeder between the feeder loading section of the component supply device of a specific work machine (12, 14) out of the multiple work machines (12, 14), and the feeder loading section of the component supply device of the work machine (12, 14) which is adjacent to the specific work machine (12, 14) out of the multiple work machines (12, 14), wherein the transfer device includes a first storage section for storing the feeder, and transfers the feeder between the feeder loading section of the specific work machine (12, 14) and the first storage section, or between the feeder loading section of the adjacent work machine (12, 14) and the first storage section, characterized in that the first storage section is provided between the feeder loading section of the specific work machine (12, 14) and the feeder loading section of the adjacent work machine (12, 14), outside the movement range of the mounting head due to the moving device of the specific work machine (12, 14), and outside the movement range of the mounting due to the moving device of the adjacent work machine (12,14). a transfer device that transfers the feeder between the feeder loading section of the component supply device of a specific work machine (12, 14) out of the multiple work machines (12, 14), and the feeder loading section of the component supply device of the work machine (12, 14) which is adjacent to the specific work machine (12, 14) out of the multiple work machines (12, 14), wherein the transfer device includes a first storage section for storing the feeder, and transfers the feeder between the feeder loading section of the specific work machine (12, 14) and the first storage section, or between the feeder loading section of the adjacent work machine (12, 14) and the first storage section, characterized in that the first storage section is provided between the feeder loading section of the specific work machine (12, 14) and the feeder loading section of the adjacent work machine (12, 14), outside the movement range of the mounting head due to the moving device of the specific work machine (12, 14), and outside the movement range of the mounting due to the moving device of the adjacent work machine (12,14).