A fan device according to one embodiment of the present invention is provided with an impeller, a motor which rotates the impeller, and a cylindrical housing which has an air inlet open upward and which surrounds the impeller on the outside radially of the impeller. The radially inner surface of the housing has an axially extending extension surface and a first sloped surface which connects to the upper side of the extension surface. The upper end of the first sloped surface connects to the air inlet, and the first sloped surface extends radially outward as the first sloped surface extends from the upper side to the lower side. The impeller has an impeller hub having an axially extending outer peripheral surface, and also having a plurality of axial flow blades which extend radially outward from the outer peripheral surface of the impeller hub and which are circumferentially arranged side by side. The axial flow blades extend downward as the axial flow blades extend from the front side in a rotational direction to the rear side in the rotational direction. The outermost end portions of the axial flow blades, the outermost end portions being located on the radially outermost sides of the axial flow blades, are arranged below the first sloped surface at an axial distance therefrom and are located below the lower end of the first sloped surface.