A filter apparatus includes a low pass filter and a high pass filter connected in series to each other. The low pass filter includes first acoustic resonators including a resonant frequency and an anti-resonant frequency, first inductors, and first capacitive elements. The high pass filter includes second inductors, second capacitive elements, and second acoustic resonators. A first attenuation band caused by the anti-resonant frequency of the first acoustic resonators is provided at a low frequency side of a pass band and a second attenuation band caused by the resonant frequency of the second acoustic resonators is provided at a high frequency side of the pass band. A third attenuation band caused by a first LC resonant circuit is provided at a low frequency side of the first attenuation band and a fourth attenuation band caused by a second LC resonant circuit is provided at a high frequency side of the second attenuation band.