A power converter including a plurality of switching circuits connected in series, each of the switching circuits comprising: a non-latching type switching element that has two main terminals and a control terminal; and a circuit connected to the control terminal having a first path and a second path; the first path comprising: a voltage detector arranged to detect the voltage between the two main terminals of the switching element and arranged to provide a voltage signal; a first voltage amplifier connected in series to the voltage detector and arranged to amplify the voltage signal of the voltage detector; and a control current source connected to the output of the first voltage amplifier; and the second path comprising: a delay device having a gate signal and a delay amount setting signal as input signals, wherein the delay device is arranged to delay the gate signal, in accordance with the delay- amount setting signal; a second voltage amplifier having an input connected to the delay device and an output; and a gate resistor connected to an output side of the second voltage amplifier at one end, wherein an output of the control current source and a second end of the gate resistor are connected to the control terminal of the switching element, the plurality of switching circuits include a first switching circuit having a first non-latching type switching element having a first storage time, and a second switching circuit having a second non-latching type switching element having a second storage time that is longer than the first storage time, and for the first non-latching type switching element, the delay-amount setting signal is set higher than that of the second non-latching type switching element to increase the delay amount of its delay device to make the turn-off timing of the first non-latching type switching element coincident with a turn-off timing of the second non-latching type switching element. a non-latching type switching element that has two main terminals and a control terminal; and a circuit connected to the control terminal having a first path and a second path; the first path comprising: a voltage detector arranged to detect the voltage between the two main terminals of the switching element and arranged to provide a voltage signal; a first voltage amplifier connected in series to the voltage detector and arranged to amplify the voltage signal of the voltage detector; and a control current source connected to the output of the first voltage amplifier; and the second path comprising: a delay device having a gate signal and a delay amount setting signal as input signals, wherein the delay device is arranged to delay the gate signal, in accordance with the delay- amount setting signal; a second voltage amplifier having an input connected to the delay device and an output; and a gate resistor connected to an output side of the second voltage amplifier at one end, wherein an output of the control current source and a second end of the gate resistor are connected to the control terminal of the switching element, the plurality of switching circuits include a first switching circuit having a first non-latching type switching element having a first storage time, and a second switching circuit having a second non-latching type switching element having a second storage time that is longer than the first storage time, and for the first non-latching type switching element, the delay-amount setting signal is set higher than that of the second non-latching type switching element to increase the delay amount of its delay device to make the turn-off timing of the first non-latching type switching element coincident with a turn-off timing of the second non-latching type switching element. a voltage detector arranged to detect the voltage between the two main terminals of the switching element and arranged to provide a voltage signal; a first voltage amplifier connected in series to the voltage detector and arranged to amplify the voltage signal of the voltage detector; and a control current source connected to the output of the first voltage amplifier; and the second path comprising: a delay device having a gate signal and a delay amount setting signal as input signals, wherein the delay device is arranged to delay the gate signal, in accordance with the delay- amount setting signal; a second voltage amplifier having an input connected to the delay device and an output; and a gate resistor connected to an output side of the second voltage amplifier at one end, wherein an output of the control current source and a second end of the gate resistor are connected to the control terminal of the switching element, the plurality of switching circuits include a first switching circuit having a first non-latching type switching element having a first storage time, and a second switching circuit having a second non-latching type switching element having a second storage time that is longer than the first storage time, and for the first non-latching type switching element, the delay-amount setting signal is set higher than that of the second non-latching type switching element to increase the delay amount of its delay device to make the turn-off timing of the first non-latching type switching element coincident with a turn-off timing of the second non-latching type switching element.