PURPOSE: To provide electric wiring connectors for indoor electric connection/ branching of such kind that there is no danger of error connection or the like while being easy in the connection/branching of the respective wires or addition/ change after wiring.

CONSTITUTION: Respective connectors 1, 1a are provided with power supply input terminals 4/5 for a power supply 3 and output terminals 7 to be mounted at an appliance, and the power supply input terminals 4 of the respective connectors 1, 1a and are mutually connected with the power supply output terminals 5 of the other connectors 1, 1a. At this time, at least one of the respective output terminals 7 to be mounted at an appliance is connected simultaneously and internally. Further, at last one connecting terminal 9 for connecting the fellow terminal 7 of the respective connectors to be mounted at an appliances, where no connection is performed, is provided.