PURPOSE: To form three batten ridge lines by providing a mountain-shape swollen part on the batten side of a body, a thin laminating lower tongue on the rear side, a thin laminating upper tongue on the head side, and a horizontal surface band directing from the rear side to the head side on the valley part, respectively.

CONSTITUTION: A flat roof tile body 1 has a mountain-shape swollen part 8 on a batten side 2; a thin laminating lower tongue 6 for effective width regulation on the batten side corner part on a rear side 3; and a thin laminating upper tongue 7 for effective width regulation on an insert side 4 corner part on a head side 5, respectively. The surface 111 of the body 1 is provided with a horizontal surface band 9 directing from the rear side 3 to the head side 5 on the valley part 11a; a cut surface 10 on the head side end part 511 of the swollen part 8; a fitting recessed part 11 on the rear side end part 512; and a flashing projection 13 extending from the rear side 3 to the insert side 4, respectively. The reverse surface of the body 1 is further provided with a recessed part corresponding to the swollen part 8; a placing base leg contact part on the horizontal reverse band of the valley part; a hook on the rear side 3; and a flashing projection extending from the head side 5 to the batten side 2, respectively. Thus, three clear batten ridge lines are formed at tiling roofing, and rainwater is diffusively carried.