Abstract: The invention relates to a vehicle door system with two vehicle doors, with a vehicle body which encloses a passenger compartment and has a common vehicle door opening for the two vehicle doors, wherein, for closing the door opening, the vehicle doors being movable in a manner such that they move from an open position into a closed position and relative to each other and, in the closed position, each are adjacent to the other in a connecting region via a connecting end side, and with impact protection which has stiffening elements for stiffening the vehicle doors in the vehicle opening, and wherein at least one first stiffening element is arranged in the connecting region of the one vehicle door and at least one stiffening element is arranged in the connecting region of the other vehicle door.