A surface acoustic wave (SAW) filter device includes first and second longitudinally coupled SAW filter units. The first and second filter units are cascade-connected to each other. A phase of a signal flowing through a first signal line electrically connecting second IDTs of the first and second SAW filter units is different by about 180° from a phase of a signal flowing through a signal line electrically connecting third IDTs of the first and second SAW filter units. A SAW resonator is connected between the first and second signal lines. A resonance point of the SAW resonator is set in an attenuation region in the vicinity of the edge of a low frequency side of a filter passband or an anti-resonance point of the SAW resonator is set in an attenuation region in the vicinity of the edge of a high frequency side of the filter passband.