A component carrier , comprising: a base structure ; an electrically conductive wiring structure on the base structure ; and an electrically insulating layer structure in contact with a side wall of the electrically conductive wiring structure ; wherein the wiring structure is made of one metallic material and has a nonrectangular cross-sectional shape configured so that an adhesion promoting constriction is formed by the wiring structure ; characterized in that the adhesion promoting constriction is formed as at least one of the group consisting of: the constriction is formed by a double trapezoidal cross-section of the wiring structure with narrow ends of both trapezoids facing each another so that the cross-sectional shape of the wiring structure is as a sandglass shape; the constriction is formed by a concave side wall of the wiring structure , wherein the wiring structure has a first horizontal extension (D1) at a contact position with the base structure , has a second horizontal extension (D2) at an end position opposing the contact position, and has a third horizontal extension (D3) at an intermediate position between the contact position and the end position, wherein the third horizontal extension (D3) is smaller than the first horizontal extension (D1) and is smaller than the second horizontal extension (D2); the constriction is formed by a trapezoidal cross-sectional portion of the wiring structure with a wide end on the base structure and a narrow end facing a bottom end of a rectangular cross-sectional portion of the wiring structure , wherein the width of the narrow end of the trapezoidal cross-sectional portion of the wiring structure has the same width as the bottom end of the rectangular cross-sectional portion of the wiring structure . a base structure ; an electrically conductive wiring structure on the base structure ; and an electrically insulating layer structure in contact with a side wall of the electrically conductive wiring structure ; wherein the wiring structure is made of one metallic material and has a nonrectangular cross-sectional shape configured so that an adhesion promoting constriction is formed by the wiring structure ; characterized in that the adhesion promoting constriction is formed as at least one of the group consisting of: the constriction is formed by a double trapezoidal cross-section of the wiring structure with narrow ends of both trapezoids facing each another so that the cross-sectional shape of the wiring structure is as a sandglass shape; the constriction is formed by a concave side wall of the wiring structure , the constriction is formed by a double trapezoidal cross-section of the wiring structure with narrow ends of both trapezoids facing each another so that the cross-sectional shape of the wiring structure is as a sandglass shape; the constriction is formed by a concave side wall of the wiring structure , wherein the wiring structure has a first horizontal extension (D1) at a contact position with the base structure , has a second horizontal extension (D2) at an end position opposing the contact position, and has a third horizontal extension (D3) at an intermediate position between the contact position and the end position, wherein the third horizontal extension (D3) is smaller than the first horizontal extension (D1) and is smaller than the second horizontal extension (D2); the constriction is formed by a trapezoidal cross-sectional portion of the wiring structure with a wide end on the base structure and a narrow end facing a bottom end of a rectangular cross-sectional portion of the wiring structure , wherein the width of the narrow end of the trapezoidal cross-sectional portion of the wiring structure has the same width as the bottom end of the rectangular cross-sectional portion of the wiring structure . <EOS>