Abstract: An inflatable gasket sealing device for a door or a moving panel comprises an inflatable sealing gasket (14) fixed on the periphery of the door or the panel (10) and protected by a cover (30, 32) that includes a slot (36) through which a shoe (24) carried by the gasket passes, which shoe is intended to press against a fixed surface (12) when the gasket is inflated, a longitudinal internal partition (26) of the gasket forming return means for returning the shoe (24) to its rest position. The device is applicable, in particular, to the sliding or swing doors of railway cars.