1. A power module in which a plurality of switching elements connected in series between a first power terminal and a second power terminal and a circuit configured to connect connecting points thereof to an output terminal are formed, the power module comprising:a heat radiation plate to which the switching elements are contacted;
a sealing body configured to seal a perimeter of the plurality of switching elements and a part of each of the first and second power terminals and the output terminal so as to expose at least one portion of the heat radiation plate;
a regulating portion formed on the sealing body, the regulating portion configured to regulate a thickness of a thermally-conductive material when contacting the heat radiation plate to a cooling plate facing the heat radiation plate with the thermally-conductive material; and
a protruding portion for positioning protruding from a center portion of the regulating portion, wherein
the regulation portion and the protruding portion for positioning are cylindrical, and a diameter of the protruding portion for positioning is smaller than a diameter of the regulating portion.