A window-raising device for a vehicle provides a two-cable winding drum, a hood to support and partially surrounding the drum on a support plate to form a cable passage. A flange extends from the winding drum to support sliding movement of an end of one of the cables. An opening in the flange is defined by an outer side ramp that is angled relative to an axis of rotation of the drum. The ramp is positioned between two walls that are roughly parallel to the axis of the drum and formed below the flange. The present invention thereby permits a reduction in the total height of the winding drum for the same number of grooves. The cable is inserted at an angle relative to the axis of the drum by sliding it on the ramp. Thus, the drum and the device as a whole are made more compact.