An aerodynamic cover of a suspension device of a vehicle includes an upper horizontal portion that is located on an upper side of the arm member and extends in a horizontal direction, a lower horizontal portion that is located under the arm member and extends in the horizontal direction, an engaging portion that is provided on one of the upper and lower horizontal portions and engaged with the arm member, and a bolt receiving portion that is provided on the other horizontal portion and bolted to the arm member. The engaging portion includes an arm portion extending in the horizontal direction, and a claw portion provided on a distal side of the arm portion and engaged with the arm member. A rib provided on the arm portion extends in a direction of extension of the arm portion, and protrudes in a vertical direction with respect to the arm portion.