PURPOSE: To prevent fatigue break of the core wire and the clad of a covered cable connected to a receptacle plug by providing a slider capable of being freely connected at any position in its circular direction and a rotatable mechanism swinging in upper or lower direction.

CONSTITUTION: A receptacle plug is an electrode to be inserted into a receptacle fixing electrode to give an electrical connection and its one end has an annular sliding electrode plug 1 which forms an annular electrode. A fixing holding part 2 fixes and holds the plug 1. An upper and lower and circular direction contact electrode slider 3 has a cable core branched in both poles and connected thereto and makes, slidably contact with the electrode plug 1 in a circular shape along the plug 1 and can be selectively positioned at any of upper, lower, right or left position. A flexible cable clamp 5 is selectively positioned at any of upper, lower, right or left position. A rotation limit stopper 8 is a stopper for acting when the slider makes circumferential rotation along the annular sliding electrode. Since the plug has a clamp 5 and an electrode slider 3 capable of being selectively positioned at any position in upper lower and circular direction fatigue break of the core wire and the clad of a connection cable 9 is prevented.