PURPOSE: To reduce influence such as unnecessary mixing of a high-frequency signal of a circumferential coil, etc., by fitting a surface wave filter to the reverse surface side of a printed board.

CONSTITUTION: The chip 10 of the surface wave filter is stuck onto an earth terminal 7, and a pad electrode and a lead terminal 8 are connected onto the chip 10 electrically by a gold wire 11. Further, an end part of the chip 10 is coated with an absorber 12 for attenuating a reflected wave. The center part of a metallic terminal 9 and the surface wave filter chip 10 are covered with caps 13 and 14, which are adhered for sealing. Then, the surface wave filter is arranged on the reverse surface of the printed board and adhered.