A drive circuit of a power semiconductor device, comprising: - a control circuit that is configured to control ON and OFF switching of the power semiconductor device; - a DC power supply (8, 9) that supply a voltage between control terminals of the power semiconductor device; and - a switching element (11, 19) that is connected between the control terminals of the power semiconductor device, - wherein the DC power supply includes a first DC power supply that is configured to supply a positive voltage between the control terminals of the power semiconductor device while the power semiconductor device is in an ON state and a second DC power supply that is configured to supply a negative voltage between the control terminals of the power semiconductor device while the power semiconductor device is in an OFF state; and - wherein the switching element (11, 19) is configured to turn ON in a case where a power supply voltage of the second DC power supply drops below a predetermined threshold or is configured to turn ON in a case where a voltage between the control terminals of the power semiconductor device increases in a state where the power supply voltage of the second DC power supply has dropped, and thereby is configured to cause a short-circuit between the control terminals of the power semiconductor device, characterized by further comprising: a power supply voltage detection circuit that is configured to detect a drop in the power supply voltage of the DC power supply (8, 9) and to output a signal to turn OFF the power semiconductor device to the control circuit in a case where the power supply voltage of the DC power supply (8, 9) reaches a predetermined power supply voltage drop amount, and characterized in that the predetermined power supply voltage drop amount is set smaller than a drop amount of the power supply voltage of the second DC power supply (8, 9), on which the switching element (11, 19) turns ON, or the predetermined power supply voltage drop amount is set smaller than a drop amount of the power supply voltage of the second DC power supply, on which the switching element (11, 19) turns ON in a case where the voltage between the control terminals of the power semiconductor device increases. - a control circuit that is configured to control ON and OFF switching of the power semiconductor device; - a DC power supply (8, 9) that supply a voltage between control terminals of the power semiconductor device; and - a switching element (11, 19) that is connected between the control terminals of the power semiconductor device, - wherein the DC power supply includes a first DC power supply that is configured to supply a positive voltage between the control terminals of the power semiconductor device while the power semiconductor device is in an ON state and a second DC power supply that is configured to supply a negative voltage between the control terminals of the power semiconductor device while the power semiconductor device is in an OFF state; and - wherein the switching element (11, 19) is configured to turn ON in a case where a power supply voltage of the second DC power supply drops below a predetermined threshold or is configured to turn ON in a case where a voltage between the control terminals of the power semiconductor device increases in a state where the power supply voltage of the second DC power supply has dropped, and thereby is configured to cause a short-circuit between the control terminals of the power semiconductor device, a power supply voltage detection circuit that is configured to detect a drop in the power supply voltage of the DC power supply (8, 9) and to output a signal to turn OFF the power semiconductor device to the control circuit in a case where the power supply voltage of the DC power supply (8, 9) reaches a predetermined power supply voltage drop amount, and characterized in that the predetermined power supply voltage drop amount is set smaller than a drop amount of the power supply voltage of the second DC power supply (8, 9), on which the switching element (11, 19) turns ON, or the predetermined power supply voltage drop amount is set smaller than a drop amount of the power supply voltage of the second DC power supply, on which the switching element (11, 19) turns ON in a case where the voltage between the control terminals of the power semiconductor device increases.