The filter device includes: a first body including an inductor and a capacitor; a second body that is mounted on the first body and that includes an acoustic wave element; a filter circuit including an inductor, a capacitor, and an acoustic wave element; a first capacitor; and a second capacitor. The first body further includes a first signal terminal and a second signal terminal. The filter circuit is, in a circuit configuration, provided between the first signal terminal and the second signal terminal. The first capacitor is provided on a first path connecting the first signal terminal and the filter circuit. The second capacitor is provided on a second path connecting the second signal terminal and the filter circuit.