PURPOSE: An assembly construction is provided to construct walls having excellent heat insulation effect because the walls are constructed by a double structure with general wall materials not to construct a thick wall material that has better heat insulation effect than the general wall material. CONSTITUTION: An assembly construction(10) comprises membranes and metal boards with plate type or wave type. The membranes connect between post frames or roof frames(30b) in order to make interior walls on the post frame and the roof frame respectively. The membranes have wires in both sides thereof. The wires are inserted into insertion grooves forming in the inner side of each post frame or each roof frame to be corresponded to each other. The metal boards with plate type or wave type connect between the post frames or the roof frames in order to make exterior walls on the post frame and the roof frame respectively. The metal board comprises fitting brackets in lengthwise under the board. The fitting bracket is inserted into insertion grooves forming on the exterior of each post frame or each roof frame to be corresponded to each other.
