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 10 a and 10 b connected to their back-gate electrode. A driving circuit has an NMOS transistor 11 a having a load resistor 12 a at its drain electrode and NMOS transistor 11 b having a load resistor 12 b 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.