An electromagnet switch has a metal contact for a switch terminal that projects from a case and is wired to one end of a coil. A male connector member surrounds an outer periphery of the metal contact. The male connector member is connected to a female connector member that is provided at a tip end of a cable used for supplying electric power to the coil. Such a penetrating hole is formed in a case that reaches the metal contact.A tester terminal can contact the metal contact through the penetrating hole for conducting conductive testing of the electromagnet switch, in a commercial field.