A device includes a circuit board, a power conversion module disposed to face the circuit board, a bus bar connected to the power conversion module, and a shielding portion that shields an electromagnetic wave. The bus bar extends through a side edge of the circuit board from one side to an opposite side of the circuit board along a thickness direction of the circuit board. The shielding portion is disposed between the bus bar and the side edge of the circuit board, extends from the one side to the opposite side along the thickness direction of the circuit board, and extends to both sides of the bus bar along the side edge of the circuit board.