A grille shutter device includes a fin unit including slat members inside an opening provided at a part of a decorative side of a vehicle front. The fin unit is configured to selectively assume a closed state and an open state, and the closed state is a state where the slat members are each disposed so as to close the opening in a vehicle front view. The open state is a state where the slat members have been moved from respective positions in the closed state to a vehicle rear side of the opening and arrayed in a row substantially along a vehicle front-rear direction.