Abstract: A connector includes first and second connector parts to be connected to each other. A plate-like terminal provided in the first connector part is maintained at a power supply voltage or a ground potential. A plug connected to a signal line is supported by a first insulation part provided on the plate like terminal. The plug includes a protrusion part protruding from the first insulation part. A first terminal is configured by a plate spring supported by a second insulation part provided in the second connector part. The first terminal has an extreme end part to be engaged with a side surface of the protrusion part when the first and second connector parts are connected to each other. A second terminal for power supply or ground is supported by the second insulation part to contact with the plate-like terminal when the first and second connector parts are connected to each other.