The present invention relates to an impedance matching device and includes: a matching element array unit through which a transmitted pulse output from a system and a reflected received pulse of the transmitted pulse pass an extraction/calculation unit extracting pulse information from the pulses calculating impedance values corresponding to the pulse information and calculating a matching impedance value at which the response characteristics of the received pulse are best an array control unit routing the matching element array unit according to the matching impedance value a first conversion unit converting the frequency of the transmitted pulse into a carrier frequency and outputting the carrier frequency to the matching element array unit a second conversion unit converting the carrier frequency output from the matching element array unit into a low frequency and a conversion control unit outputting a signal for controlling the frequency conversion of the first conversion unit and the second conversion unit.
