Flat cable type high frequency filter (10) includes dielectric substrate (20) in the extension of high frequency signal's transmission direction. The structure composing who forms is overlapped in dielectric substrate (20) by dielectric layer (201, 202). Long banding conductor pattern (401, 402) form on the dull and stereotyped face of dielectric layer (202) of dielectric layer (201) side. Conductor pattern (401, 402) form width wide as far as possible for dielectric substrate (20) according to desirable inductance value. Conductor pattern (410) package presss from both sides dielectric layer (202) for the capacitance coupling, is formed to relative with regulation area and conductor pattern (402). Conductor pattern (410) utilize bonding conductor (60) and conductor pattern (401) to be connected for the capacitance coupling.