PURPOSE: To simplify the roofing operation of an S-shaped pantile, and to improve the accuracy of roofing.

CONSTITUTION: A flange-shaped back board section 1 having specified height is mounted at one side end section of a plain roof-tile 2 centering around the plain roof-tile section 2 consisting of a curved section having a large curvature radius. A semicylindrical channel tile section 3 is installed while being continued to the plain roof-tile 2 on the side reverse to the side, on which the back board section 1 is set up. The channel tile section 3 and the above-mentioned back board section 1 are terminated at the places of fixed length (L) from the head section (A) of the tile, and stopper sections 19, 39 are formed by these sections 3 and 1. A semicylindrical bead section 5 is formed from the place of the stopper section 39 shaped to the channel tile section 3 in the stopper sections. The front end section of the bead section 5 and the side end section of the tail end section (B) of the plain roof-tile section 2 are formed in the same surface, and sections among these stopper sections 19, 39 and the tail end section (B) are formed in overlapping sections.