An electronic device (100, 200, 300, 400, 500, 700) comprising: a foldable body (113, 213, 313) transitionable between an unfolded state and a folded state; a flexible display device (111, 211, 311, 641) disposed on a front face of the body, the flexible display device being foldable together with the body; and a cover (103, 203, 303) enclosing at least a portion of a rear face of the body, the cover being foldable together with the body, wherein at least a portion of the flexible display device includes an exposed region that is visible at least when the foldable body is in the folded state, characterized by a second display device (105, 205, 305, 307) disposed on a rear face of the body to be opposite to the flexible display device; wherein the second display device (105, 205, 305, 307) is concealed by the cover (103, 203, 303) when the foldable body (113, 213, 313) is in the unfolded state and is exposed when the foldable body is in the folded state due to a difference in relative displacement between the flexible display device and the cover at a folding operation; wherein the cover (103, 203, 303) and the foldable body (113, 213, 313) are fixed to each other at a fixing portion (107, 207, 309) and the cover is slidably coupled to the foldable body relative to the second display device (105, 205, 305, 307); and wherein the second display device (105, 205, 305, 307) is arranged in a region that is exposed due to a movement of the cover relative to the second display device (105, 205, 305, 307), wherein the second display device (105, 205, 305, 307) is exposed to an outside of the cover (113, 213, 313) as the cover is slid into the folded state of the foldable body. a foldable body (113, 213, 313) transitionable between an unfolded state and a folded state; a flexible display device (111, 211, 311, 641) disposed on a front face of the body, the flexible display device being foldable together with the body; and a cover (103, 203, 303) enclosing at least a portion of a rear face of the body, the cover being foldable together with the body, wherein at least a portion of the flexible display device includes an exposed region that is visible at least when the foldable body is in the folded state, characterized by a second display device (105, 205, 305, 307) disposed on a rear face of the body to be opposite to the flexible display device; wherein the second display device (105, 205, 305, 307) is concealed by the cover (103, 203, 303) when the foldable body (113, 213, 313) is in the unfolded state and is exposed when the foldable body is in the folded state due to a difference in relative displacement between the flexible display device and the cover at a folding operation; wherein the cover (103, 203, 303) and the foldable body (113, 213, 313) are fixed to each other at a fixing portion (107, 207, 309) and the cover is slidably coupled to the foldable body relative to the second display device (105, 205, 305, 307); and wherein the second display device (105, 205, 305, 307) is arranged in a region that is exposed due to a movement of the cover relative to the second display device (105, 205, 305, 307), wherein the second display device (105, 205, 305, 307) is exposed to an outside of the cover (113, 213, 313) as the cover is slid into the folded state of the foldable body.