To provide a blower device capable of inhibiting invasion of foreign matter into a case.

This blower device comprises a scroll case 12 housing a blower fan 10, hole parts 33a-33e formed on an outer surface 14d oriented to an part of the scroll case 12 above a vertical surface and passing through to the inside of the scroll case 12, and overflow weir parts 34-37 formed around the hole parts 33b, 33d, checking foreign matter 91 mixed in water 90 flowing on an outer surface 14d, and making overflow water 90 invade into the scroll case 12 via the hole parts 33b, 33d.