PURPOSE: To simplify the assembly and installation work of furniture, etc., in a building site of such as dwelling houses, etc., with a coupling metal-fixture for construction of units such as furniture, etc., and to make it possible to promote work efficiency without requiring any skill.

CONSTITUTION: A back panel fixing metal fixture 1 and a side panel fixing metal fixture 5 are fixed to the back of an erected setting bed in a state to partially overlap each other with a screw 6 over the full length from the floor to the ceiling. One side end edge of a back panel 3 is butted to a back panel receiving surface 1c of the back panel fixing metal fixture 1 and a back panel corner receiver 5c of the side panel fixing metal fixture 5, and the back panel 3 is fixed to the setting bed 2 together with the back panel fixing metal fixture 1 with the screw. A longitudinal long interlocked fitting section 4a of a side panel 4 is fitted to a coupling fitting section 5d of the side panel fixing metal fixture 5 to erect and fix the side panel 4 to form the rear wall and side walls of furniture, and the walls can be used for partition walls for dwelling, etc.