A power control unit in which a converter is disposed on an inverter, and a gap is formed between an inverter case and a converter case, wherein the inverter has an inverter protruding portion that protrudes toward the converter side on a surface of the inverter case which faces the converter, the converter has a converter protruding portion that protrudes toward the inverter side on a surface of the lower cover which faces the inverter that closes an opening formed on the lower surface side of a case main body of a converter case, the inverter protruding portion and the converter protruding portion are disposed in contact with each other, and the converter protruding portion is disposed on the lower cover to correspond to a position of a rib that can come into contact with the lower cover.