To provide an intermediate frequency(IF) band filter circuit, in which the defect of the deterioration of bandwidth, ripples and attenuation characteristics occurs is eliminated by preventing matching of an IF band filter from being deviated by fluctuation of impedance, before or after the IF band filter or changing of the peripheral temperature of an IF filter in the IF band filter circuit for the IF part of a receiver.

A serial circuit, composed of changeover switches 2 and 8 and an IF band filter 9, is provided for switching impedance 3-7 for impressing a received signal as input impedance by a control signal 18 in the IF part of the receiver. Furthermore, a serial circuit composed of changeover switches 10 and 16 is provided for switching impedance 11-15 as the output impedance by a control signal 19 on the output stage of the IF band filter 9. Also a CPU 20 for controlling the changeover switches 2, 8, 10 and 16 and a temperature detecting part 22 are connected serially, so that optimal impedance (input impedance and output impedance) can e selected automatically with respect to temperature changes.