Abstract: An expandable vehicle-mounted shelter is a construction connected to a vehicle, in which a shelter container body 2 thereof is laterally enlarged to have an enlarged internal space in which special equipment, such as communication equipment, medical equipment, etc., and other equipment is provided, or otherwise to be utilized as a compartment for carrying goods. In the shelter container body, expandable frames are laterally oppositely provided, each frame having folding sections. In each of the folding sections, a support plate is pivotably connected, at the upper or lower end thereof, to the body via hinge means, and at least one folding plate is foldably connected to the support plate, so that the folding section can be pivoted around the hinge means to spread out, thereby enlarging the space inside the shelter.