To provide a filter element for a common mode, which has an excellent noise attenuation characteristic.

The film element has a coil part 5 configured in a cylindrical form as a whole, by winding beltlike signal conductors 9a and 9b and beltlike ground conductors 8a and 8b of the same number as the conductors 9a and 9b, with the beltlike insulator 7b between. The conductors 9a and 9b are installed in parallel mutually being separated in the direction of the width of the beltlike insulator 7b on one side of the insulator 7b, and the conductors 8a and 8b are installed in parallel mutually being separated in the direction of the width of the beltlike insulator 7b on the other side of the insulator 7b. The filter element also comprises input terminals 2a and 2b connected to one end of the conductors 9a and 9b, respectively, output terminals 3a and 3b connected to the other end of the conductors 9a and 9b, respectively, and a ground terminal 4 for grounding the conductors 8a and 8b.