The present invention provides a filter circuit that can achieve both sharp bandpass characteristics and high power handling capability. The filter circuit includes: an input terminal that has a signal input; a four-port device that divides input signals; a band stop filter that has the center frequency of the input signals within the stopband, and causes the out-of-stopband signals among the input signals to pass; two bandstop resonators circuits that cause the signals passing through the band stop filters to pass, and reflect the signals; open ends that are connected in parallel to the two bandstop resonators circuits; and an output terminal that outputs the signals reflected by the band stop filters and the bandstop resonators circuits and combined at the four-port device.