Provided is a filter device includes: a first coil group including a plurality of coils arranged along a central axis and spirally wound with a first inner diameter; and a second coil group including a plurality of coils arranged along the central axis and spirally wound with a second inner diameter larger than the first inner diameter. A pitch between respective turns of the plurality of coils of the second coil group is larger than a pitch between respective turns of the plurality of coils of the first coil group.