PURPOSE: To make the matching work between prestage and poststage elements easy by providing a hole-shaped circuit-missing part at an intermediate part of a conductor connecting the prestage circuit element and the poststage circuit element.

CONSTITUTION: An input terminal 2 and an output terminal 3 are provided to a board 1 via connecting conductors 5, 5 and an FET15. The connecting conductor 5 is provided with a matching stub 7, and the hole-shaped circuit-missing part 8 is formed to a part by means of an etching means. A length L2 of the stub 7 from its root 7a to the circuit-missing part 8 is matched to the electric characteristic of the 2nd priority of a circuit element of the poststage side scheduled for its use and set to a location attaining the matching state as to the element. In using a different kind as the FET15 or capacitors 13, 14, the circuit-missing part 8 of the stub 7 is cut off by a knife or the like. Thus, the matching work is attained easily.