Structure for Shielding Rail Exposed to Outside of Sliding Door Vehicle

A structure for shielding a rail exposed to an outside of a sliding door vehicle includes a rail configured to be mounted in a vehicle, a drive unit movably connected to the rail, and a cover unit having one side connected to the drive unit and configured to be foldable and unfoldable. The cover unit is configured to move to open or close a space in which the rail is positioned.