A switching circuit, comprising: a normally-off junction field-effect GaN transistor including a source terminal (S31), a drain terminal (D31), and a gate terminal (G31), 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 (G31), the drive device having a first power input terminal (V31) and a second power input terminal (V32) to which the source terminal (S31) is connected; a first rectifier connected between the source terminal (S31) and the gate terminal (G31), and including an anode on a side of the source terminal (S31) and a cathode on a side of the gate terminal (G31); 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 (G31) 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 (S31), a drain terminal (D31), and a gate terminal (G31), 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 (G31), the drive device having a first power input terminal (V31) and a second power input terminal (V32) to which the source terminal (S31) is connected; a first rectifier connected between the source terminal (S31) and the gate terminal (G31), and including an anode on a side of the source terminal (S31) and a cathode on a side of the gate terminal (G31); 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 (G31) 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. <EOS>