PURPOSE: To secure a sufficient strength and a finish accuracy and simplify the construction and reduce the construction period.
CONSTITUTION: An upper rail 14 is fixed at a specified position of the ceiling face 11 of a building structure 10. A lower rail 18 is fixed at a specified position of the floor face 15 of the building structure 10 to correspond to the upper rail 14. An interior wall panel 7 made of a fiber reinforcing gypsum board having communication holes 2 within the thickness are attached between the upper rail 14 and the lower rail 18. An adhesive paste 19 in which gypsum powder bearing the adhesive is dissolved in water is applied on the rugged joint face 3, 5 of the interior wall panel. The interior wall panel 7a is connected to each other in turn to complete the interior wall.