Plug connector for providing an electrical connection to a conductor track connection of a conductor track of a printed circuit board, having the features: the plug connector has a first printed circuit board having a conductor track connection of a conductor track; the plug connector has a mating area for plugging the printed circuit board into the plug connector; the mating area extends parallel to the first printed circuit board; a contact element is provided in the plug connector; wherein the mating area is a cut-out that is embodied in a second synthetic material plate (K2; 120); wherein a spring element is moreover provided next to the contact element in the plug connector, wherein the mating area and the contact element and the spring element are embodied and arranged in such a manner that in a plugged state of the plug connector the printed circuit board that is plugged into the mating area is arranged parallel to the first printed circuit board, and the conductor track connection is arranged opposite the conductor track connection; and an electrical connection of the conductor track connection to the conductor track connection is provided by way of the contact element and the spring element; and wherein the first printed circuit board has a predetermined amount of flexibility, and the spring element is embodied as one piece with the first printed circuit board, characterized by the second synthetic material plate being arranged in a sandwich-like manner between a first (K1; 170) and third synthetic material plate (K3; 130, 140); and wherein the first printed circuit board is arranged on the third synthetic material plate (K3; 130, 140); and wherein a fourth synthetic material plate (K4; 150, 160) is arranged on the first printed circuit board with the result that a cover is provided on the first printed circuit board; and wherein a cut-out (135, 145) for accommodating the contact element is embodied in the third synthetic material plate (K3; 130, 140); and wherein the spring element is a leaf spring element that is provided by means of a U-shaped cut-out that is embodied in the first printed circuit board; wherein the U-shaped cut-out encompasses the spring element, and the conductor track connection is arranged on the spring element; and wherein the conductor track connection is an edge of a cut-out that is embodied in the first printed circuit board; and the contact element has a contour that cooperates with the conductor track connection; and wherein the edge of the cut-out is embodied in a circular manner, and the contact element is embodied in a spherical manner; and wherein a cut-out for accommodating the deflected spring element is embodied in the fourth synthetic material plate (K4; 150, 160). the plug connector has a first printed circuit board having a conductor track connection of a conductor track; the plug connector has a mating area for plugging the printed circuit board into the plug connector; the mating area extends parallel to the first printed circuit board; a contact element is provided in the plug connector; wherein the mating area is a cut-out that is embodied in a second synthetic material plate (K2; 120); wherein a spring element is moreover provided next to the contact element in the plug connector, wherein the mating area and the contact element and the spring element are embodied and arranged in such a manner that in a plugged state of the plug connector the printed circuit board that is plugged into the mating area is arranged parallel to the first printed circuit board, and the conductor track connection is arranged opposite the conductor track connection; and an electrical connection of the conductor track connection to the conductor track connection is provided by way of the contact element and the spring element; and wherein the first printed circuit board has a predetermined amount of flexibility, and the spring element is embodied as one piece with the first printed circuit board, characterized by the second synthetic material plate being arranged in a sandwich-like manner between a first (K1; 170) and third synthetic material plate (K3; 130, 140); and wherein the first printed circuit board is arranged on the third synthetic material plate (K3; 130, 140); and wherein a fourth synthetic material plate (K4; 150, 160) is arranged on the first printed circuit board with the result that a cover is provided on the first printed circuit board; and wherein a cut-out (135, 145) for accommodating the contact element is embodied in the third synthetic material plate (K3; 130, 140); and wherein the spring element is a leaf spring element that is provided by means of a U-shaped cut-out that is embodied in the first printed circuit board; wherein the U-shaped cut-out encompasses the spring element, and the conductor track connection is arranged on the spring element; and wherein the conductor track connection is an edge of a cut-out that is embodied in the first printed circuit board; and the contact element has a contour that cooperates with the conductor track connection; and wherein the edge of the cut-out is embodied in a circular manner, and the contact element is embodied in a spherical manner; and wherein a cut-out for accommodating the deflected spring element is embodied in the fourth synthetic material plate (K4; 150, 160).