PURPOSE: To attain miniaturization and thinning by inserting plural foil shape conductors on which dielectric coating are applied to a through hole provided at a flat ferrite core formed integrally with ferrite for low frequency and ferrite for high frequency.

CONSTITUTION: The through hole 3 is provided at the flat ferrite core 1 formed integrally with the ferrite 101 for low frequency and the ferrite 102 for high frequency. Also, the foil shape conductor 2 is formed by extending plural tinning annealed copper flat wires 4 in parallel and sticking them by sandwiching with polyester 5, and it is inserted to the through hole 3 one by one. Also, L1 and L2 components formed between the foil shape conductor 2 and the ferrite cores 101, 102, and C1 and C2 components formed between the foil shape conductor 2 and both ferrite cores 101, 102 setting the polyester 5 as a conductor layer are provided. Thereby, it is possible to accomplish the noise filter with size nearly equal to that of the flat ferrite core, which attains the miniaturization and the thinning.