To prevent penetration of a soldering flux into a switch part by mounting a cover plate on the switch part, to suppress increase in contact resistance caused by the flux, to prevent contact failure, and enhance reliability.

A dielectric 1 into which a center pin 3 is inserted is fit to a funnel-shaped outer conductor 4. The center pin 3 comes in contact with a first contact foot 6 having an elastic contact arm 5, is energized upward, and a signal is transmitted from the first contact foot 6 to a second contact foot 7. By pushing-in the center pin 3 with a coaxial adapter 40, a signal is transmitted from the first contact foot 6 to the center pin 3. Terminals of the first and second contact feet 6, 7 are surface-mounted on a conductor of a printed board by reflow soldering. By closely mounting a cover plate 2 on a switch part, rising up of flux based on surface tension to the witch part by reflow soldering in surface mounting is suppressed.