A driving device for a door with a wing (1) being pivotable around an intermediate horizontal pivot (2) which is so guided as to be vertically slidable along fixed lateral uprights (3), while a pivotable guiding arm (5) is provided on at least one side of the wing, and has one end (6) pivotally connected to the upper part of the respective fixed upright (3), and its opposite end (7) pivotally connected to the door wing (1), at a point that is eccentric to the horizontal pivot (2) around which the wing is pivotable, characterized in that it is placed between at least one of the lateral pivotable guiding arms (5) and the door wing (1 and comprises a hydraulic or pneumatic cylinder (8, 11) and a mechanism (13, 15, 17, 18) which is adapted for converting the rectilinear movement of the cylinder (8, 11) into a relative angular movement over about 180' of the lateral pivotable guiding arm (5) and the door wing (1).