To connect a short coaxial cable to an electronic apparatus with an existing connector without providing any special constitution on the electronic apparatus side.

A male screw section 54 connectable to the output terminal of a tap-off is formed at one end section of a conductive tubular body 52, and a female screw section 60 connectable to a connector 18 for connecting a coaxial cable is formed at the other end section. A central conductor connection section 62 is arranged along the length direction in the tubular body 52. One end section of the central conductor connection section 62 is protruded outward from one end section of the tubular body 52, and the other end section of the central conductor connection section 62 can be connected to the central conductor 28 of the connector 18 inserted into the tubular body 52 from the other end section of the tubular body 52.