Power supply device and solid electrolytic capacitor

A power supply device comprising:

• a switching regulator outputting a DC voltage;
• and
• a solid electrolytic capacitor smoothing the DC voltage of the switching regulator, wherein:
• the power supply device is configured to input the DC voltage smoothed by the solid electrolytic capacitor to a load circuit,
• the solid electrolytic capacitor includes:
• a plurality of capacitor elements stacked on each other;
• two anode terminals;
• a cathode terminal;
• and
• an outer packaging resin covering the plurality of capacitor elements, the two anode terminals, and the cathode terminal so that a part of each of the two anode terminals and a part of the cathode terminal are exposed from the outer packaging resin, each of the plurality of capacitor elements includes an anode body and a cathode part disposed on a surface of the anode body with a dielectric layer disposed between the anode body and the cathode part,
• the anode body includes two protrusions, each of the two protrusions protruding from @ ding one of both ends of the cathode part,
• each of the two anode terminals is electrically connected to a corresponding one of the two protrusions of the anode body,
• the cathode terminal is electrically connected to the cathode part,
• the two protrusions in each of the plurality of capacitor elements are electrically conducted to each other,
• one of the two anode terminals is connected to an output terminal of the switching regulator in a direct current manner, and
• another of the two anode terminals is connected to an input terminal of the load circuit in a direct current manner.