Abstract: A mountable and demountable partition structure for motor vehicles, such as vans and station wagons, is provided. The partition comprises a panel which is adapted to extend substantially from top to bottom and from side to side of the vehicle, where it is mounted; and is mounted by fastener means extending downwardly through brackets at the bottom edge of the panel into plates secured in the floor of the vehicle, and through brackets at the top of the panel into tracks mounted between roof ribs in the roof of the vehicle. The panel comprises three panel portions, each of which extends across the width of the panel, where the upper panel portion is tilted fowardly from the vertical, and the lower portion is tilted rearwardly from the vertical, when mounted.