The present specification discloses a foldable display device displaying stored images by a folding or unfolding action of a foldable housing and a method of controlling therefor. The foldable display device according to the present specification includes a display unit including a first display area spatially or visually separated by the folding or unfolding action of the foldable housing. When the first display area changes a state from a state of facing a second direction (e.g., user direction) to a state of facing a first direction (e.g., third party direction), stored images are displayed on the first display area. By doing so, a third party can easily check the stored images displayed on the first display area.