Transmission line type noise filter with small size and simple structure, having excellent noise removing characteristic over wide band including high frequency band

A transmission line type noise filter having a central conductor, an external conductor, and a dielectric formed between said central conductor and said external conductor, said transmission line type noise filter comprising:

• a metal fine wire made of valve-operational metal and serving as said central conductor;
• a capacitance forming portion formed over a predetermined length on the periphery of said metal fine wire;
• and
• a conductor layer formed on a surface of said capacitance forming portion and serving as said external conductor;
• said capacitance forming portion comprising:
• a sintered body formed on said metal fine wire and made of said valve-operational metal;
• a dielectric film formed on a surface of said sintered body and serving as said dielectric;
• and
• a solid electrolyte layer formed on a surface of said dielectric film.