To reduce radiation noise generated when a semiconductor device in a power unit performs switching, a core is provided outside the power unit. The closer the core is disposed to the semiconductor device that is generating the radiation noise, the greater the effect of reducing the radiation noise is obtained. However, since there has been no space to provide the core inside the power unit, there has been a limitation in the reduction of radiation noise. The invention provides a power unit including a core in the interior thereof. In order to install a first core inside the power unit, a first output-side conductor bar, a second output-side conductor bar, and a third output-side conductor bar are connected to an output of an inverter include a first bundle portion. The first bundle portion passes through a first penetrating opening of the first core provided inside the power unit.