A multipath elimination filter comprises a digital filter for receiving a digitalized FM modulation signal or phase modulation signal as its input signal, and eliminating multipath distortion from the input signal by adjusting tap factors for the input signal, an envelope detecting section for detecting an envelope of the input signal to generate a reference signal, an error detecting section for generating an error signal by performing a differential operation on a desired signal generated by the digital filter and the reference signal, an error component limiting section for monitoring the error signal for a direct-current component and controlling an amplitude of the error signal to generate a corrected error signal, and a tap factor updating section for adjusting the tap factors based on the corrected error signal so that the amplitude of the error signal approaches zero. This makes the entire system converge toward stabilization to eliminate multipath distortion.