To provide a noise filter used in common to a plurality of devices energized by an AC power supply.

The noise filter 41 is manufactured as one electric component in which noise filter circuits 42, 43 are connected in cascade and new output terminals 57, 58 are provided to the cascade connection points. An AC power supply 10 is connected to input terminals 51, 52, a power input section of a control section 23 is connected to the output terminals 57, 58 and output terminals 53, 54 are connected to a power input section of an inverter 22. Thus, malfunction of the control section 23 caused by propagation nose Nc generated from the inverter 22 is prevented by the noise filter 41 being one electric component, which also attenuates both propagation noise Nc' caused by radiation noise Nr intruded from the inverter 22 to the control section 23 and a noise terminal voltage en resulting from the propagation noise Nc.