A power conversion device includes a semiconductor unit, a terminal unit, a capacitor unit, a control board, and a case. The semiconductor unit is arranged at a position facing a plate surface of the control board. The terminal unit and the capacitor unit are arranged side by side in a x direction along the plate surface of the control board on the opposite side of the control board with respect to the semiconductor unit. At least a part of the capacitor unit or the terminal unit is located outside a first end of the semiconductor unit in the x direction. A first recess in which a first electrical wiring is arranged is formed in a portion of the case facing the first end so as to be recessed inside the case.