Power supply apparatus

A power supply apparatus comprising:

• at least one magnetic component having a coil section of a ring shape;
• a case body housing the magnetic component and having an opening plane facing an axial direction of the coil section, the case body being made of a conductor and constituted of a bottom plate portion and a plurality of side plate portions standing from circumferential edges of the bottom plate portion toward the opening plane;
• a case lid having an inner surface facing the opening plane so as to close the opening plane and;
• and
• a plurality of conductive parts electrically connecting the case body and the case lid to each other at the opening plane at a resistance lower than any other portion of the case body and the case lid;
• wherein
• the conductive parts are provided so as to satisfy a positional relationship that at least one of the conductive parts is disposed at an intersection point at which a straight line making an angle within a range of 45±15 degrees with a perpendicular line drawn from a center of the coil section of the magnetic component to a closest one of the side plate portions to the center intersects with the closest one of side plate portions when viewed from the axial direction.