There is provided a remote control wiring mechanism, which makes it easy to construct a system by facilitating a connection work and treatment of members constructing the system. A main unit 20 comprises signal terminals 27 connected to signal lines and power supply terminals 28 for supply power used for driving a relay. A relay unit 30 having a relay is detachably connected to a relay socket 26 of the main unit 20 and is coupled integrally to the main unit 20. When a transmission signal including on-off information of a switch is received through the signal lines, the on-off state of the switch is reflected in the switching of the relay.