Electric power conversion apparatus

An electric power conversion apparatus comprising:

• a heat-generating element;
• a case having a cooling wall portion on which the heat-generating element is held and accommodating the heat-generating element;
• a flow passage cover having an opening formed therein and covering a surface of the cooling wall portion on an opposite side to a surface of the cooling wall portion on which the heat-generating element is held;
• a standing portion standing from the cooling wall portion and inserted in the opening of the flow passage cover;
• a flow-passage side wall portion formed in one of the cooling wall portion and the flow passage cover to protrude toward the other of the cooling wall portion and the flow passage cover;
• a coolant flow passage surrounded by the cooling wall portion, the flow passage cover and the flow-passage side wall portion;
• and
• a sealant that seals both a gap between the cooling wall portion and the flow passage cover at a periphery of the coolant flow passage and a gap between the standing portion and the flow passage cover.