As illustrated in FIG. 2, component mounter 20 includes board conveyance device 21 that conveys board S in the X-direction, head 22 that includes suction nozzle for picking up the components supplied by feeder 30, and head moving mechanism 23 that moves head 22 in the XY-direction, and display 27 such as an LCD (refer to FIG. 1). In addition, component mounter 20 includes mounting control device 28 (refer to FIG. 5) which is configured with well-known CPU, ROM, RAM, and the like, to control the entire device. Mounting control device 28 outputs a control signal to board conveyance device 21, head 22, head moving mechanism 23, display 27, and the like. In addition, component mounter 20 has two upper and lower areas to which feeder 30 can be attached in the front. The upper area is supply area 20A to which feeder 30 can supply the components, and the lower area is stock area 20B in which feeder 30 can be stocked. Supply area 20A and stock area 20B are provided with feeder base 40 having an L-shaped side view and to which multiple feeders 30 are attached. Component mounter 20 need not have stock area 20B.