there is provided with a filter circuit including : an input terminal configured to input an input signal ; first to ith blocks which have first to ith resonators as transmission lines having first to ith resonance frequencies ; a power divider configured to distribute the input signal to the first to ith blocks ; a power combiner configured to combine signals which have passed through the first to ith blocks to obtain a combined signal ; and an output terminal configured to output the combined signal , wherein a jth block includes a phase adjustment unit which provides a signal of the jth block with a phase difference within a range of +} degrees from a signal of a th block , and a resonator having a large amount of group delay has a greater line width than a resonator having a small amount of group delay .