PURPOSE: To prevent the infiltration of rain water by securing the stable coupling state even if there are molding and construction

CONSTITUTION: A horizontally shingled roof board 1 is constituted of a face plate section 2, a ridge side molding section 3, and an eaves side molding section 4. A hook section 5 erected at the ridge side edge of the face plate section 2 toward the eaves side is provided on the ridge side molding section 3, and a rising space section 50 is formed by the hook section 5. The eaves side molding section 4 is provided with a folded-down section 6 trailed from the eaves side edge of the face plate section 2, a horizontal section 7 folded at its lower end toward the ridge side, a drip section further folded with its tip toward the eaves side, and a contact section 9 folded down with its tip.