A tailgate arrangement which is located in the region of the rear opening (12) of a vehicle and in the closed position borders a cargo space (16), has an upper tailgate part (18) which is coupled in the region of the upper edge (20) of the rear opening (12) and a lower tailgate part (22) which is coupled in the region of the lower edge (24) of the rear opening (12) of the vehicle and is aligned essentially horizontally in the open position. An expansion element (28) is detachably fixed on the inside of the lower tailgate part (22) and in the open position of the lower tailgate part (22) expands the cargo space (16) and closes it relative to the exterior of the vehicle.