To provide a surface acoustic wave filter which can cope with balanced input/output, has a satisfactory filter characteristics and has ladder-type circuit constitution that can highly precisely measure the filter characteristics even if an unbalanced circuit is used.

In the surface acoustic wave filter of a balanced input/output type, a ladder-type circuit constituted of plural surface acoustic wave resonators is formed of a piezoelectric substrate. The ladder-type circuit has input side balanced signal terminals A1 and A2 and output side balance signal terminals B1 and B2. A series arm resonator S1 is connected between the input side balanced signal terminal A1 and the output side balanced signal terminal B1 and a series arm resonator S2 between the input side balanced signal terminal A2 and the output side balanced signal terminal B2. At least one impedance element C1 is connected between a first signal constituted of the input side balanced signal terminal A1 and the output side balance signal terminal B1, and a second signal line constituted of the input side balanced signal terminal A2 and the output side balanced signal terminal B2.