PURPOSE: To set stable construction against the positional shift and blowing-up force of a small wall panel by fitting holes to be formed with combining notched channels arranged on both the joining end surfaces of inorganic facing material lining panels and the small wall panel, to be fixed with members.

CONSTITUTION: First, the respective joining end surfaces of partition panels 10 and 30 and a small wall panel 20 which are manufactured in a factory or the like are butted to each other, and the opening sections of notched channels 13, 23, and 24, 33 are fitted on each other and jointed so that boles 15 and 25 may be formed. After that, on the holes 15 and 25, plywood square-column- shaped fitting-on members 16 and 26 are fitted by hammering the members with a hammer or the like, and the internal wall surfaces of the holes 15 and 25 and the external surfaces of the fitting-on members 16 and 26 are fixed to each other to be bonded with adhesives. As a result, the small wall panel 20 can be very stably constructed against positional shift due to its own weight and also against a flowing-up force in the vertical upper direction due to earthquake or the like.