PURPOSE: To make it possible to easily connect wall panels to each other and, at the same time, to make it possible to simply remove one or a plurality of wall panels only.

CONSTITUTION: The first metal fixture 20 and the second metal fixture 22 are respectively fixed to the side ends of the first wall panel 10 and the second wall panel 12. Taking pieces 30, 32, 34 and 36 are projected backward of the metal fixtures 20 and 22, and the locking pieces 30-36 are inserted into openings 42, 44 and 46 of the third metal fixture 24. After the locking pieces 30-36 are inserted into the openings 42-46, the metal fixtures 20 and 22 are connected to the metal fixture 24 by pushing the third metal fixture 24 down. In such a coupling state, the third metal fixture is lifted upward, and then, the metal fixtures 20 and 22 can be separated from the metal fixture 24 by retracting it backward, and the wall panel 10 or the wall panel 12 can be drawn out forward.