Sealing system of B-pillarless rear sliding door

The invention relates to a vehicle door for closing a door opening provided in a vehicle frame, and to a vehicle door system with the vehicle door according to the invention. The vehicle door has body panels, an inner panel which, in the fitted position, faces the vehicle interior, and an outer panel which, in the fitted position, faces away from the vehicle interior, said panels being connected fixedly to each other and delimiting a cavity.With the proviso of providing a vehicle door of the type mentioned at the beginning, which can be produced in a less complicated manner, it is proposed that an end panel for delimiting the cavity is provided as a further body panel at least on one narrow side of the vehicle door, and that the end panel is connected fixedly laterally to the outer panel and the inner panel.