PURPOSE: To form a stable electrical connection by applying the constitution wherein the plug section of a conductor connector caulked to the conductor end of a cable core is inserted in the axial hole of a center conductor.

CONSTITUTION: The exposed end 16 of a copper conductor in a cable core 11 is axially abutted to the end of a center copper body 14 in a unit, and the abutted section is covered with a copper conductor connection tube 17. Furthermore, the connection tube 17 is compressed and caulked as integral part of the conductor end 16 and the end of the center conductor 14, thereby completing the required connection. On the other hand, the exposed end 18 of an Al conductor in a core 12 is fitted with an Al conductor connector 19. Furthermore, a rod-like plug section 20 is formed at one end of the connector 19, and a cylindrical socket section 21 at the other end respectively in an axial direction. Then, the conductor end 18 is inserted in the socket section 21, and this socket section 21 is compressed and caulked onto the end 18 of the Al conductor, thereby connecting the end 18 to the Al conductor connector 19 electrically.