Contact switch and connection assisting pin

The present invention is provided with: a housing (100) having an electric wire insertion part (4) into which an electric wire connected to a power source for supplying power to a load device is inserted, and an electric wire insertion part (5) into which an electric wire connected to the load device is inserted, the electric wire insertion part (4) and the electric wire insertion part (5) each opening in the front surface direction; conductive metal pieces (10) provided to the wire insertion section (4) and the wire insertion section (5), respectively; and an opening/closing part (60) for switching between electrically connecting or insulating the conductive metal member (10) of the wire insertion part (4) and the conductive metal member (10) of the wire insertion part (5), the housing (100) having a conductor insertion port. The conductor insertion port allows a rod-shaped connection conductor to be inserted from a first direction, which is the arrangement direction of the wire insertion part (4) and the wi