PURPOSE: To prevent short-circuit to a ground conductor at the time of mounting a surface acoustic wave circuit device.

CONSTITUTION: The bottom of a TO can of a surface acoustic wave circuit device 1 is closely brought into contact with a common ground conductor 6 formed on one face of a dielectric substrate 5, and attaching holes 7 and through holes of insulating layers 8 on side faces of these holes 7 are provided from the other face of the dielectric substrate 5 to the bottom side of the TO can 2, and input/output pins 3 and 4 are inserted through them and are bent and are soldered to conductor patterns 9A and 9B for connection formed on the other face of the dielectric substrate 5.