Electric power conversion device

An electric power conversion device, comprising a reactor, a switching device connected to the reactor, a capacitor, and a case receiving the reactor, the switching device and the capacitor therein,

• wherein the case comprises:
• a first member having a first region defining therein a first passage in which a cooling medium flows, and a second region disposed on a side of the first region;
• and
• a second member disposed so as to at least partly overlap with the second region as seen from a direction orthogonal to the second region in a spaced apart relationship to the second region, and internally defining a second passage connected to the first passage, and
• wherein the reactor is positioned in the first region, and one of the switching device and the capacitor is positioned on a surface of the second member facing away from the first member, the other of the switching device and the capacitor being positioned between the second member and the second region of the first member.