Patent ID: 8810335

Claim:
A noise filter comprising: a first magnetic core that includes a plurality of leg portions, and a first connection portion and a second connection portion, which are respectively connected to first-side ends and opposite-side ends of the plurality of leg portions; a plurality of coils that are wound on the plurality of leg portions, respectively; and a second magnetic core that is configured to be attachable to and detachable from the first magnetic core such that a closed magnetic path, which intersects with each of the first connection portion and the second connection portion and which passes through the plurality of leg portions, is formed, wherein the first magnetic core includes a normal mode inductance, the closed magnetic path includes a common mode inductance, wherein the common mode inductance is modified by adjusting a position at which the second magnetic core is attached to the first magnetic core, the second magnetic core is substantially U shaped, the second magnetic core is attached to the first magnetic core such that the second magnetic core sandwiches the plurality of leg portions, the first connection portion, and the second connection portion at two outer sides of the first magnetic core, and an overlapping area of the first magnetic core and the second magnetic core when seen through in a longitudinal direction of the plurality of leg portions is adjusted such that the common mode inductance of the closed magnetic path is modified.