A power conversion device includes element array having a high side arm element and a low side arm element, positive electrode-side conductor electrically connected to the high side arm element, negative electrode-side conductor electrically connected to the low side arm element, output-side conductor electrically connected to the high side arm element and the low side arm element, high side driving signal line that controls the high side arm element, and low side driving signal line that controls the low side arm element, the positive electrode-side conductor and the negative electrode-side conductor extend from the element array toward one side in first direction, the output-side conductor extends from the element array toward the other side opposite to the one side in the first direction, and the high side driving signal line and the low side driving signal line extend from the element array toward a second direction crossing the first direction.