Power conversion device

A power conversion device, comprising:

• a cooling unit that is a prism, the interior of which is hollow, and that has a refrigerant inlet portion and a refrigerant outlet portion, the cooling unit having, in the interior thereof, a refrigerant channel through which a refrigerant flows from the refrigerant inlet portion towards the refrigerant outlet portion;
• electronic devices that are respectively disposed on three or more side surfaces of the cooling unit excluding a refrigerant inlet surface, in which the refrigerant inlet portion is disposed, and a refrigerant outlet surface, in which the refrigerant outlet portion is disposed, the electronic devices being cooled by boiling of the refrigerant;
• and
• a hollow outer case that covers the electronic devices,
• wherein the electronic device of highest heat density or largest amount of heat from among the electronic devices is covered by the hollow outer case and disposed on a lowest horizontal surface, from among the side surfaces of the cooling unit.