A foldable display device comprising: a foldable display panel ; a back cover configured to cover a rear side of the foldable display panel ; and a coupling member configured to couple the foldable display panel and the back cover to each other, wherein the foldable display panel has one or more folding sections (B) that are folding areas and flat sections (A) disposed at both sides of each of the folding sections (B), the back cover includes folding covers covering the folding sections (B) and flat covers covering the flat sections (A), the folding covers and the flat covers are connected to each other, the folding covers each have one or more first coupling portions for connection with the flat covers , the flat covers each have one or more second coupling portions for connection with the folding covers to be coupled to the first coupling portions, and when the folding sections (B) are folded, a coupling state between the first coupling portions and the second coupling portions is changed in accordance with folding of the display panel such that the display panel is folded with the folding section (B) of the display panel and the folding cover in close contact with each other so that the folding cover supports the folding section (B), characterized in that folding supporters having a U-shaped bending portion , a first supporting portion disposed at an end of the bending portion , and a second supporting portion disposed at another end of the bending portion are disposed on the folding cover , and wherein the folding supporters are rotatable about a middle portion of the bending portion . a foldable display panel ; a back cover configured to cover a rear side of the foldable display panel ; and a coupling member configured to couple the foldable display panel and the back cover to each other, wherein the foldable display panel has one or more folding sections (B) that are folding areas and flat sections (A) disposed at both sides of each of the folding sections (B), the back cover includes folding covers covering the folding sections (B) and flat covers covering the flat sections (A), the folding covers and the flat covers are connected to each other, the folding covers each have one or more first coupling portions for connection with the flat covers , the flat covers each have one or more second coupling portions for connection with the folding covers to be coupled to the first coupling portions, and when the folding sections (B) are folded, a coupling state between the first coupling portions and the second coupling portions is changed in accordance with folding of the display panel such that the display panel is folded with the folding section (B) of the display panel and the folding cover in close contact with each other so that the folding cover supports the folding section (B), characterized in that folding supporters having a U-shaped bending portion , a first supporting portion disposed at an end of the bending portion , and a second supporting portion disposed at another end of the bending portion are disposed on the folding cover , and wherein the folding supporters are rotatable about a middle portion of the bending portion . <EOS>