To provide a coupling sleeve for inorganic insulation cables which is easy to manufacture and easy to connect on both sides, and its using method.

The coupling sleeve (1) of almost a cylinder shape is designed in order to couple an inorganic insulation coaxial cable (2) with adaptation equipment (5, 6) which are the coaxial themselves. This sleeve protects 1st points of contact (11, 20), and brings the 2nd points of contact (13, 22) directly between the above cable and each two edges of the above adaptation equipment. This sleeve is designed so that it may preferably have an opening (28) for filling up after completing assembly. This filling is performed with an insulator material. The opening is closed after filling. The above sleeve is soldered preferably to a 2nd contactor (13) of the above cable and a 2nd contactor (22) of the above adaptation equipment, respectively.