Switching device

To provide a switching device capable of a switch-controlling a voltage source regardless of voltage changes in the voltage source to be switched and the voltage source employed for switch control. A switching path 61 includes, between the input terminal 1 and output terminal 4 for a voltage source, a series connection of the source or drain electrodes of PMOS transistors 10a and 10b connected to their back-gate electrode. A driving circuit has an NMOS transistor 11a having a load resistor 12a at its drain electrode and NMOS transistor 11b having a load resistor 12b at its drain electrode, which are connected to the gate electrodes of the PMOS transistors, respectively and receives the output from the logic inverter 14 for the switching control.