One aspect of the present invention provides a switch in which an insulation failure is hardly generated. In the switch, a conductive region and an insulating region are formed in a sliding surface of a slider in a normally-closed fixed contact unit in the order toward a Z-direction, a conductive region and an insulating region are formed in a sliding surface of the slider in a common contact unit in the order toward the Z-direction, and the slider slides from the conductive regions to the insulating regions to switch from a closed state to an opened state.