Abstract: A stabilized DC power supply device providing a plurality of different stabilized DC powers with regulated voltage levels. Stabilized DC powers with rated currents of 2A. or less are taken out from transistor series regulator circuits, another stabilized power with rated current of 8-10A. or more is output from a magnetic amplifier regulator circuit and other powers with rated current of 8-10A. or less are obtained from transistor switching regulator circuits. The regulated voltage output from one of the switching regulator circuits is used as an input DC power for the series regulator circuits and is fed to them through an DC-AC inverter circuit and respective rectifier circuits. Input powers to both the switching regulator circuits and the magnetic amplifier regulator circuit are from a DC power source through a single DC-AC inverter circuit. The device is small in size and good in efficiency.