PURPOSE: To certainly prevent a linear body from being separated from a connector by compressing the right and left packings between the end surface of a cylindrical spacer and the right and left couplings by tightening a coupling and pressing the outer circumferential surface of the linear body inserted into the packing.

CONSTITUTION: With a left tightening coupling 7 separated from a cylindrical main body 1, a linear heating body 2 is inserted through the hole of a right coupling 5 of the cylindrical main body and pulled out to the right and left. Two coated wires 3 are inserted into the packing 8 of the left coupling 7, and their respective core wires 3a, 3a are electrically connected to 2a. In this connection status, the core wire 2a of the linear heating body is bare and is not exposed to the outside, is compressed between insertion needles 1a inside an insulation coating material 2b, and is electrically connected. Therefore, even if the core wire 2a is an relatively weak aggregate bundle of short fiber of carbon, electrical connection can be obtained surely and with high efficiency.