Switching regulator

A switching regulator includes: a boost chopper circuit A including a plurality of inductances (2, 3, 4 and 5) which are connected in parallel with a D.C. power supply (1) for boosting the D.C. power supply (1), a plurality of commutating diodes (6, 7, 8 and 9) which are connected to output sides of those inductances (2, 3, 4 and 5), respectively, a plurality of switching elements (10, 11, 12 and 13) for connecting the D.C. power supply (1) and nodes between the respective inductances (2 to 5) and the respective diodes (6 to 9) in a short-circuiting manner, and a smoothing capacitor (14) connected in series to a combined output section of those diodes (6 to 9); a control circuit (15) for controlling the on/off operation of those switching elements (10 to 13); and a load (16) connected in parallel with the smoothing capacitor (14). The plurality of switching elements (10 to 13) repeatedly operate while the operation of the plurality of switching elements (10 to 13) is sequentially delayed by a predetermined period of time.