PURPOSE: To shorten the labor hour for construction and to support a movable 'tokonoma' at low cost by a simple technique by bringing the four corner sections of floor panels near, widening a floor, and installing and fixing bearing legs at the corner sections.

CONSTITUTION: A panel bracket metal 4 is semi-fixed at one corner section of a floor panel 5, in which the panel bracket metal 4 is mounted previously at a center in a factory, and the panel bracket metal 4 is housed in the external size of the floor panel 5. The floor panel 5 is carried out to a jobsite, a bearing leg 3 is set up to the panel bracket metal 4 first, and the panel bracket metal 4 at the corner section is half turned at that time and fixed on the outside of the external size of the floor panel 5. The floor panel 5 is installed at a specified position, the three positions of the unfixed corner sections of another floor panel 5 are brought near to the fixed corner section of the bracket metal 4, and a connector 8 is placed from an upper section and fastened by nails, etc. A bolt 1 for adjusting height is screwed, and height is adjusted. The process is repeated, the floor panels 5 with the bearing legs 3 are connected successively, and the floor is widened in successively.