PURPOSE: To reduce power loss generated by a capacitor voltage division circuit by separately connecting circuits constituted by the series connection of surge absorbing elements and resistors in parallel with each of capacitors respectively when a plurality of the capacitors are connected in series and connected to a power supply.

CONSTITUTION: The series connection circuit of a first surge absorbing element 11 and a first resistor 12 is connected in parallel with a first smoothing capacitor 4, and the series connection circuit of a second surge absorbing element 13 and a second resistor 14 is bonded in parallel with a second smoothing capacitor 5. When voltage sharing is normal at that time, only the slight leakage currents of the surge absorbing elements 11, 13 are made to flow through the resistors 12, 14 connected in series, thus extremely reducing generated loss. Even when imbalance is generated in the sharing voltage of the capacitors 4, 5, currents flowing through the resistors 12, 14 are lowered extremely, thus reducing generated loss.