Abstract: Roof wind-power generator device of the present invention includes a rotor with a horizontal axis of rotation substantially at right angles with respect to the direction of the wind. The rotor is placed in a frame aimed at being arranged on the ridge of a roof. The frame includes, on each of both sides of the roof, a set of deflectors focusing the air flows in the direction of the rotor. Each set of deflectors has four walls, two side walls, an upper wall and a lower wall, which form a cone-shaped tunnel narrowing from its outer end to its end. The frame and sets of deflectors include devices permitting an adapting to the slopes of the roof, while keeping, for the tunnels, the same ratio between openings.