A noise filter includes a plurality of LC parallel resonant circuits
having a plurality of coils which are connected in series and
electrically connected to external electrodes at both ends thereof, and
capacitors which are connected in parallel to the coils, respectively,
and are disposed inside an insulator while being sequentially connected
in tandem to signal wires. Resonance frequencies of the respective LC
parallel resonant circuits are preferably different from each other.
Further, a shield electrode is disposed between the coils, and the shield
electrode also defines a capacitance-forming electrode for preventing
magnetic coupling between the two coils.