A switching circuit, comprising: a normally-off junction field-effect GaN transistor including a source terminal, a drain terminal, and a gate terminal, the normally-off junction field-effect GaN transistor having a gate portion including a p-type nitride semiconductor; a drive device of one output type electrically connected to the gate terminal, the drive device having a first power input terminal and a second power input terminal to which the source terminal is connected; a first rectifier connected between the source terminal and the gate terminal, and including an anode on a side of the source terminal and a cathode on a side of the gate terminal; a capacitor connected between a cathode side of the first rectifier and the one output of the of drive device; a first resistor connected between the capacitor and the one output of the drive device; a second resistor, one side of the second resistor being connected to the one output of the drive device, another side of the second resistor being connected between the cathode side of the first rectifier and the capacitor; a second rectifier including an anode on a side of the capacitor and a cathode on a side of the drive device; and a third rectifier including an anode on the side of the gate terminal and a cathode on the side of the drive device, wherein an anode side of the second rectifier is connected between the capacitor and the first resistor, no resistor is provided between the cathode side of the second rectifier and the one output of the drive device, and the third rectifier is connected in parallel with the capacitor and the first resistor connected in series. a normally-off junction field-effect GaN transistor including a source terminal, a drain terminal, and a gate terminal, the normally-off junction field-effect GaN transistor having a gate portion including a p-type nitride semiconductor; a drive device of one output type electrically connected to the gate terminal, the drive device having a first power input terminal and a second power input terminal to which the source terminal is connected; a first rectifier connected between the source terminal and the gate terminal, and including an anode on a side of the source terminal and a cathode on a side of the gate terminal; a capacitor connected between a cathode side of the first rectifier and the one output of the of drive device; a first resistor connected between the capacitor and the one output of the drive device; a second resistor, one side of the second resistor being connected to the one output of the drive device, another side of the second resistor being connected between the cathode side of the first rectifier and the capacitor; a second rectifier including an anode on a side of the capacitor and a cathode on a side of the drive device; and a third rectifier including an anode on the side of the gate terminal and a cathode on the side of the drive device, wherein an anode side of the second rectifier is connected between the capacitor and the first resistor, no resistor is provided between the cathode side of the second rectifier and the one output of the drive device, and the third rectifier is connected in parallel with the capacitor and the first resistor connected in series.