A chip mounting system in which a whole system can be compact including a transfer stage and a tool holding member between a chip feeding section and a substrate holding section. In the chip mounting system, a transfer stage is disposed between a chip feeding stage and a substrate holding stage. A pick-up head and a mounting head are provided movably in a Y-axis direction in which the chip feeding stage and the substrate holding stage are aligned. A movable table which is movable in an X-axis direction, which intersects the Y-axis direction at right angles, is provided in a overwrapping movable region of the chip feeding stage and the substrate holding stage. The transfer stage and a tool holding member, which holds at least one of replacement tools for a pick-up tool and a mounting tool, are provided on the movable table.