PURPOSE: To facilitate assembly by way of more effectively using the roof of an automobile by constituting the simplified house of a support means to support a second floor board part in an expanded state and so that roughly twice as large an area as the roof area of the automobile by expanding the second floor board part.

CONSTITUTION: When a framework member 6 is lifted up by holding a pipe 6e or 6f from a storage state, pipes 6b and 6d stand upright from the storage state by working of spring shafts 6g, 6h, 6i, a roof part of a house is constituted of the pipes 6e and 6f, and an outside part of the house is constituted of the pipes 6b, 6C, 6d. In the case of folding the assembled house, a thread 8 tied on the pipe 6c is pulled from outside, and then the framework member 6 is folded by working of the spring shafts 6g-6i and the house is stored in a floor board part 1.