To contrive so that a decorative panel may not become dirty due to raindrops by attaching a throating plate to the decorative panel in the form of a hood, and acutely forming the edge end of the throating plate.

The hood-like part of a throating plate 12 is directed to the surface side of a decorative panel 11, attached by a machine screw 13 so that the hood-like part is inclined obliquely downward, and the edge end 4 of the throating plate 12 is acutely formed. Next, rain is blocked with the hood-like throating plate 12 by means of a throating decorative panel 10, since the edge end 14 of the throating plate 12 is acutely formed, a raindrop reaching the edge end 14 does not move along an end side, easily separates from the end side and drops as it is, and a large waterdrop is not formed on the edge end 14. Next, in the case where the raindrop collides against a panel 11 by the influence of strong wind, it drops in the state of the small waterdrop from the edge end 14, a largely grown raindrop does not collide against the panel 11, occurrence of dirt in the form of a stripe by the large raindrop is prevented, and dirt of the panel 11 due to raindrop is not produced.