A molding tool for producing an interior trim part of a vehicle having a decorative skin, a backing, and a foam layer arranged between the decorative skin and the backing, comprising a first molding tool element and a second molding tool element, wherein a cavity is formed between the first molding tool element and the second molding tool element, wherein the backing may be arranged on the second molding tool element and the visible side of the decorative skin may be arranged on the first molding tool element such that a hollow area is formed between the backing and a reverse side of the decorative skin, wherein a foamable mixture may be added to the hollow area, and wherein the second molding tool element may be moved relative to the first molding tool element such that the hollow area may be enlarged prior to and/or during a foaming process of the foamable mixture, characterized by at least one slide that is displaceably connected to the first molding tool element, wherein the slide is set up to press against a side facing away from the reverse side of the decorative skin during a movement of the second molding tool element relative to the first molding tool element such that the hollow area is sealed in that the reverse side of the decorative skin is pressed against a lateral surface of the backing and/or against a lateral surface of the second molding tool element.