A fluid control device includes: a case that includes a case top plate having a first vent hole, a case side plate, and a case bottom plate having a second vent hole; a pump body; and a holding member that holds the pump body relative to the case. The pump body includes a first main plate, a second main plate that faces one main surface of the first main plate, a side plate, and a driving member that is arranged on the first main plate. The first main plate includes a plurality of first openings arranged in a ring shape. The second main plate is arranged at a side of the first main plate nearer the case top plate and has a second opening at a position that overlaps the first vent hole in a plan view.