In an electronic component mounting system including a plurality of electronic component mounting apparatuses coupled in series, the system mounting an electronic component on a substrate to manufacture a mounted substrate, a substrate carried into a mounting conveyor is temporarily placed in a standby state in a substrate standby area formed by a first transfer conveyor (carry-in conveyor) of one electronic component mounting apparatus and a second transfer conveyor (carry-out conveyor) of another electronic component mounting apparatus positioned upstream of the one electronic component mounting apparatus. This eliminates the waste of time attributable to transfer of substrates and enhances the production efficiency by a compact facility.