A medical device provided with an AC power supply and a power converter having a switching element connected to the AC power supply, wherein the medical device is characterized in being provided with a series resonance capacitor (201) provided between the device GND and a power supply line connecting the AC power supply and the power converter, a resonance inductor (202) provided so as to be serially connected to the series resonance capacitor between the GND-side terminal of the series resonance capacitor and the device GND, and a high-frequency noise bypass capacitor (203) provided so as to be connected in parallel to the resonance inductor the resonance frequency of the series resonance capacitor and the resonance inductor being set so as to match the switching frequency of the power converter, and the parallel resonance frequency of the resonance inductor and the high-frequency noise bypass capacitor being set to a value between the switching frequency and the conduction noise restriction start frequency. The present invention makes it possible to reduce leak current while reducing power supply line noise.
