A connecting piece, formed as an independent unit, for connection to an electrode line and for connection to an electric implant, wherein the connecting piece has an elongate form in a longitudinal direction and a proximal end and a distal end (10a, 10b) and comprises the following: - an electrically conductive plug module, which protrudes proximally from the proximal end of the connecting piece in the longitudinal direction, - a plurality of ring-shaped electrically conductive contacts (3a, 3b, 3c) having the same outer diameter, with insulation portions (4a, 4b, 4c, 4d) arranged between said contacts (3a, 3b, 3c) in the longitudinal direction, said insulation portions (4a, 4b, 4c, 4d) having the same outer diameter, wherein the insulation portions fix the electrically conductive contacts in such a way that their position in the longitudinal direction is unchangeable, - a plurality of electric connecting lines (5a, 5b, 5c), each connecting an electric connection to a corresponding supply line of the electrode body at the distal end of the connecting piece, and - a supporting element having a substantially circular outer cross-section and having a longitudinal axis along the longitudinal direction, which supporting element is designed to carry the insulation portions and to fix them in the radial direction, and which supporting element has a through-bore over its longitudinal axis, which through-bore receives the plug module and/or a supply line of an electrode body, wherein the supporting element has n peripheral grooves (12a, 12b, 12c), which are spaced apart from one another in the longitudinal direction and which are designed to receive a moulding compound, and n recesses (13a, 13b, 13c) extending from the proximal end to the distal end parallel to the longitudinal axis, in order to guide connecting lines (5a, 5b, 5c) from the electrically conductive contacts (3a, 3b, 3c) to the distal end, wherein n corresponds to the number of electrically conductive contacts, wherein the plug module has a plug pin for making contact with the electric implant and a contact pin for establishing contact with a supply line of the electrode body, wherein the contact pin preferably has an abutment, which interacts with a hollow screw screwed in the supporting element, so that the plug module is fixed in the supporting element in the longitudinal direction. - an electrically conductive plug module, which protrudes proximally from the proximal end of the connecting piece in the longitudinal direction, - a plurality of ring-shaped electrically conductive contacts (3a, 3b, 3c) having the same outer diameter, with insulation portions (4a, 4b, 4c, 4d) arranged between said contacts (3a, 3b, 3c) in the longitudinal direction, said insulation portions (4a, 4b, 4c, 4d) having the same outer diameter, wherein the insulation portions fix the electrically conductive contacts in such a way that their position in the longitudinal direction is unchangeable, - a plurality of electric connecting lines (5a, 5b, 5c), each connecting an electric connection to a corresponding supply line of the electrode body at the distal end of the connecting piece, and - a supporting element having a substantially circular outer cross-section and having a longitudinal axis along the longitudinal direction, which supporting element is designed to carry the insulation portions and to fix them in the radial direction, and which supporting element has a through-bore over its longitudinal axis, which through-bore receives the plug module and/or a supply line of an electrode body, wherein the supporting element has n peripheral grooves (12a, 12b, 12c), which are spaced apart from one another in the longitudinal direction and which are designed to receive a moulding compound, and n recesses (13a, 13b, 13c) extending from the proximal end to the distal end parallel to the longitudinal axis, in order to guide connecting lines (5a, 5b, 5c) from the electrically conductive contacts (3a, 3b, 3c) to the distal end, wherein n corresponds to the number of electrically conductive contacts,