PURPOSE: To absorb the kinking and bending of cables in the stage of moving horizontally or vertically a welding gun by the constitution in which the same electrodes of a pair of terminal plates and an oscillating terminal body are held in contact with each other at all times via the spherical surface holding parts and spherical surface part thereof.

CONSTITUTION: The resistance welding gun moves horizontally or vertically while a pressurizing cylinder 39 is not in operation. The welding cable 11b swivels or bends relative to the welding cable 11a during such movement. In such a case, the oscillating terminal body 23 swivels or oscillates around the spherical surface part 24 and prevented the disconnection of the cables 11a, 11b without kinking or bending of the cables 11a, 11b themselves.