GRILLE SHUTTER DEVICE

A grille shutter device includes a decorative surface curved in a convex shape toward a front side of a vehicle in a vehicle width direction of a vehicle front portion and provided with an opening in a part; and a fin provided in the opening and configured to rotate about a shaft so as to open and close the opening. In the open state in which the opening is opened, a tip end on a front portion of the fin in a front-rear direction of the vehicle is in a linear shape as viewed from the front side of the vehicle, and in the closed state in which the opening is closed, an opposing tip end on the opposite side of the fin from the tip end is enlarged in the vehicle width direction to form a curve in a convex shape toward the front side of the vehicle.