To surely prevent a slip in positioning of a noise filter from an electrical wire.
This noise filter is composed of a cylindrical ferrite core 13, having a through-hole 13a for passing an electrical wire and a case 12 enclosing the ferrite core 13 inside it. An electrical wire W, passing through the through- hole 13a, is wound around an outer surface of the case 12, and then the wire W is re-inserted into the through-hole 13a. At this time, a wire fixing part 14, which can hold and fix the wire W, is arranged on a winding track of the wire W on the outer surface of the case 12. The wire fixing part 14 is composed of a stopping plane 15 and a pressing piece 16 which faces the plane 15 and being able to open and shut. A uneven antislip means 15b is formed on at least one of the facing planes of the stopping plane 15 and a pressing piece 16.
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