To offer a polarity type band pass filter which can effectively prevent receiving disturbance from adjacent channel waves under an overcrowded frequency usage condition by a simple and low cost construction.

A main circuit A is prepared, which is provided with a main parallel resonant unit in which a first dielectric resonator CV2 and a main resonant capacitor VC2 are connected in parallel resonant coupling on a signal transmission path 86, and forms a second attenuation pole; and a main series resonance unit which has a series resonant coupling element C2 which comprises a capacitor or an inductor which carries out series resonance with the main parallel resonant circuit. Moreover, a trap circuit B is prepared in which a second dielectric resonator CV1 of an inductor and a resonant capacitor VC1 for a trap are connected as parallel resonant coupling in a form of branching from the signal transmission path 86 to the ground, and which forms a first attenuation pole in a position where it overlaps with a series resonant pass-through peak of the main series resonant unit. Furthermore, a base attenuation amount adjustment circuit C is prepared which has capacitors for attenuation adjustment C3, C4, and adjusts a base attenuation amount of a blocking area adjacent in a low area side and a high area side of the pass band.