PURPOSE: To lighten a plate by forming the plate of which projecting parts extending in one direction are arranged along the traverse axial direction at regular intervals, and piling up the plates each other so as to form a panel.

CONSTITUTION: The panel for construction is provided with three sets of metal plate 2 in which projecting parts 2A extending in one direction are arranged along the traverse axial direction of the extending direction at regular intervals. These plates 2 are piled in the condition in which the respective projecting parts 2A and recessed parts are conformed to each other or mutual projecting parts are conformed to each other. Next, urethane foam resin or the like is injected between the piled plates 2, and many holes are formed on the plates 2 on the surface side so as to improve sticking strength for mortar or the like. Consequently, execution can be easily performed by lightening the weight of the plate.