A foldable device comprising: a flexible display comprises a first part, a second part and a third part disposed between the first part and the second part; a first body and a second body that supports the flexible display; a hinge that rotatably connects the first body and the second body so that the flexible display is folded; a movable support member that is disposed between the first body and the second body and supports a portion of the flexible display; wherein the first body and the second body respectively comprise a first base cover and a second base cover, and a first frame and a second frame that are respectively disposed inside the first base cover and the second base cover and support the flexible display, wherein the first part is disposed on the first frame and the second part is disposed on the second frame, wherein the movable support member comprises a slot that extends in a folding direction of the first body and the second body, wherein the first frame and the second frame comprise a pair of guide portions (73-1, 73-2) that are slidably inserted into the slot according to rotation of the first body and the second body, and an end of the first frame and an end of the second frame extend upward from respectively the first frame and the second frame and are formed to be bent toward the flexible display when the flexible display is unfolded, the guide portions being provided on the end of respectively the first frame and the second frame, wherein the movable support member that is coupled to the end of the first frame and the end of the second frame comprises a movable support having a flat surface which supports the portion in an unfolded position of the flexible display and in a state of the flexible display between the unfoled position and a folded position, and wherein the movable support member moves relative to the portion as the first body and the second body rotate between the unfolded position and the folded position. a flexible display comprises a first part, a second part and a third part disposed between the first part and the second part; a first body and a second body that supports the flexible display; a hinge that rotatably connects the first body and the second body so that the flexible display is folded; a movable support member that is disposed between the first body and the second body and supports a portion of the flexible display; wherein the first body and the second body respectively comprise a first base cover and a second base cover, and a first frame and a second frame that are respectively disposed inside the first base cover and the second base cover and support the flexible display, wherein the first part is disposed on the first frame and the second part is disposed on the second frame, wherein the movable support member comprises a slot that extends in a folding direction of the first body and the second body, wherein the first frame and the second frame comprise a pair of guide portions (73-1, 73-2) that are slidably inserted into the slot according to rotation of the first body and the second body, and an end of the first frame and an end of the second frame extend upward from respectively the first frame and the second frame and are formed to be bent toward the flexible display when the flexible display is unfolded, the guide portions being provided on the end of respectively the first frame and the second frame, wherein the movable support member that is coupled to the end of the first frame and the end of the second frame comprises a movable support having a flat surface which supports the portion in an unfolded position of the flexible display and in a state of the flexible display between the unfoled position and a folded position, and wherein the movable support member moves relative to the portion as the first body and the second body rotate between the unfolded position and the folded position.