To resolve a problem in which a conventional high-frequency switcher using a coaxial connector with a switch cannot be utilized for other than an application for alternatively selecting an antenna or a measurement unit for a signal transmission direction, and lacks in convenience.

A circuit configuration conversion device 1 is composed of: a first circuit board 3 on which coaxial connector plugs 2a and 2b are mounted at a predetermined interval L; and a second circuit board 5 on which coaxial connector receptacles 4a and 4b are mounted at the same predetermined interval L. When the coaxial connector plugs 2a and 2b are inserted into the coaxial connector receptacles 4a and 4b, in the coaxial connector receptacles 4a and 4b, movable terminals 9 are pressed by center contacts 21 and electrically separated from fixed terminals 8, and external terminals 11 are electrically contacted with external conductors 22 of the coaxial connector plugs 2a and 2b. Therefore, a first circuit 41 formed on the first circuit board 3 can be added to a circuit configured on the second circuit board 5.