Grille shutter device

A grille shutter device comprising:

• 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 having an axial direction extending in the vehicle width direction so as to open and close the opening,
• wherein the fin is configured such that in an 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 a closed state in which the opening is closed, an opposing tip end on an opposite side of the fin from the tip end is enlarged in the vehicle width direction relative to a width thereof in the open state so as to form a curve in a convex shape toward the front side of the vehicle in the vehicle width direction and
• wherein, in the open state and the closed state, the shaft is curved in a convex shape toward the front side of the vehicle in a top view of the vehicle.