Abstract: A sealing device for the bottom of a door comprises a first inverted U-shaped sectional bar (10) which extends along the bottom of a door (1), is firmly secured thereto and contains a control mechanism. A vertically movable second inverted U-shaped sectional bar (14,15) carrying a sealing strip (17) of profiled rubber is accommodated in a lower rectangular chamber formed in the first sectional bar by a horizontal partition wall (11) which extends transversely through the first sectional bar.