PURPOSE: To simplify and reduce the adjusting work and to realize miniaturization, by exposing input, output and ground terminals, molding the attenuation circuit with a synthetic resin incorporatedly and providing a spring section holding the attenuation circuit with elasticity and an electric connection terminal section.

CONSTITUTION: A tantalum resistor 20 is formed on a ceramic base 24 with the vapor deposition by thin film and the resistor 20 is adjusted accurately in advance. The end is provided with the input terminal 21, the output terminal 22 and the ground terminal 23. Further, a dummy terminal 25 is provided for the support of the ceramic base 24 simply. The holder of the resistance attenuator is sectioned into three; side holding plates 31, 32 and center holding plate 33. They are all made of metal and possible for soldering. The ceramic base 24 is supported in the holders so as to be enclosed. In this state, the side holding plate 31 is an input terminal functionally, the side holding plate 32 is an output terminal and the central holding plate 33 is a ground terminal.