Abstract: A sealing device for electrical plug connectors is configured in such a way that a favorable, cost-saving and functionally safe production of plug connectors, from a manufacturing point of view, is fulfilled. The plug connectors each have a contact carrier in a plug housing. Contact carrier is penetrated by accommodation chambers, which with one end each open out into one tub-shaped installation space of plug connector. These ends are covered by a restraining element, so that a sealing compound, which is free-flowing, curable and inserted into installation space, which is able to completely seal against contact elements that have been plugged through it, remains in the installation space. The sealing device for electrical plug connectors is provided especially for use in the automobile industry.