A flexible display device, comprising: a first body; a second body configured to move between a first position and a second position relative to the first body and comprising a support; a first cover; and a flexible display comprising: a first region positioned in front of the first body; a first connected region extending from the first region; and a second connected region extending from the first connected region, wherein when the second body is at the first position, a portion of the first connected region is curved around the support and the second connected region is parallel to the first region and faces backward, wherein when the second body is at the second position, the first connected region is co-planar with the first region and a portion of the second connected region is curved around the support, and wherein the first cover is coupled to a rear of the first body to form a rear surface of the flexible display device and configured to cover the second connected region when the second body is at the first position, wherein the flexible display device further comprises a second cover coupled to a rear of the second body to cover the second connected region when the second body is at the first position, wherein the first cover and the second cover at least partially overlap when switching between the first position and the second position, characterized by further comprising a filter disposed between the first cover and the second cover and configured to prevent intrusion of foreign matter between the first cover and the second cover. a first body; a second body configured to move between a first position and a second position relative to the first body and comprising a support; a first cover; and a flexible display comprising: a first region positioned in front of the first body; a first connected region extending from the first region; and a second connected region extending from the first connected region, wherein when the second body is at the first position, a portion of the first connected region is curved around the support and the second connected region is parallel to the first region and faces backward, wherein when the second body is at the second position, the first connected region is co-planar with the first region and a portion of the second connected region is curved around the support, and wherein the first cover is coupled to a rear of the first body to form a rear surface of the flexible display device and configured to cover the second connected region when the second body is at the first position, wherein the flexible display device further comprises a second cover coupled to a rear of the second body to cover the second connected region when the second body is at the first position, wherein the first cover and the second cover at least partially overlap when switching between the first position and the second position, characterized by further comprising a filter disposed between the first cover and the second cover and configured to prevent intrusion of foreign matter between the first cover and the second cover. a first region positioned in front of the first body; a first connected region extending from the first region; and a second connected region extending from the first connected region, wherein when the second body is at the first position, a portion of the first connected region is curved around the support and the second connected region is parallel to the first region and faces backward, wherein when the second body is at the second position, the first connected region is co-planar with the first region and a portion of the second connected region is curved around the support, and wherein the first cover is coupled to a rear of the first body to form a rear surface of the flexible display device and configured to cover the second connected region when the second body is at the first position, wherein the flexible display device further comprises a second cover coupled to a rear of the second body to cover the second connected region when the second body is at the first position, wherein the first cover and the second cover at least partially overlap when switching between the first position and the second position, characterized by further comprising a filter disposed between the first cover and the second cover and configured to prevent intrusion of foreign matter between the first cover and the second cover.