In FIG. 28, each impedance has been described in regard to the inverter 7 as an example. However, each impedance corresponds also to the inverter and the converter connected in parallel with the inverter 7, as described hereinafter. That is, the power module 110 provided in a first phase among the phases is referred to as a first power module, and the power module 110 provided in a second phase is referred to as a second power module. An impedance of an electric path from the positive electrode terminal of the capacitor C1 to the upper arm 10U in the first power module corresponds to the in-phase upper impedance. An impedance of an electric path from the positive electrode terminal of the capacitor C1 in the first power module to the upper arm 10U in the second power module corresponds to the interphase upper impedance. An impedance of an electric path from the negative electrode terminal of the capacitor C1 to the lower arm 10L in the first power module corresponds to the in-phase lower impedance. An impedance of an electric path from the negative electrode terminal of the capacitor C1 in the first power module to the lower arm 10L in the second power module corresponds to the interphase lower impedance.
