A mounting work system includes at least one feeder automatic exchange work machine configured to mount a component, which is supplied by a tape feeder mounted on a mounting stand, on a board conveyed by a conveyance device, the tape feeder mounted on the mounting stand being configured to be automatically exchanged by an operation of a tape feeder exchange device, at least one feeder manual exchange work machine configured to mount a component, which is supplied by a tape feeder mounted on a mounting stand, on the board conveyed by a conveyance device, the tape feeder mounted on the mounting stand being configured to be manually exchanged by an operator, and a housing formed with a housing space for housing at least one tape feeder, arranged in a conveyance direction of the conveyance devices, and disposed adjacent to the at least one feeder automatic exchange work machine.