An electronic device comprising: a first structure comprising a first plate, the first plate comprising a first face and a second face facing away from the first face; a second structure comprising a second plate, wherein the second plate faces the second face of the first plate and has an opening formed therein, and a first side wall extending from a first end portion of the second plate, wherein the first structure is movable in a first direction between an open state and a closed state with respect to the second structure, and wherein the first structure is positioned at a first distance from the first side wall when the first structure is in the closed state and positioned at a second distance, which is greater than the first distance, from the first side wall when the first structure is in the open state; and a flexible touch screen display, wherein the flexible touch screen display comprises: a planar portion extending across at least part of the first face, mounted to the first face, and having a first width in a second direction perpendicular to the first direction; and a bendable portion extending from the planar portion to a space between the first side wall and the first structure when in the closed state, wherein the bendable portion comprises a first portion extending from one end of the planar portion and having the same width as the first width, and a second portion extending from the first portion, facing the second plate, and having a second width less than the first width, wherein the second portion of the bendable portion is exposed visually at least in part to the outside of the electronic device through the opening of the second plate, and wherein when the first structure is moved from a closed state to an open state, the first portion of the bendable portion is pulled by a predetermined amount from the space between the first side wall and the first structure, and the first portion of the bendable portion is configured to construct the same plane as the planar portion when the first structure is in the open state. a first structure comprising a first plate, the first plate comprising a first face and a second face facing away from the first face; a second structure comprising a second plate, wherein the second plate faces the second face of the first plate and has an opening formed therein, and a first side wall extending from a first end portion of the second plate, wherein the first structure is movable in a first direction between an open state and a closed state with respect to the second structure, and wherein the first structure is positioned at a first distance from the first side wall when the first structure is in the closed state and positioned at a second distance, which is greater than the first distance, from the first side wall when the first structure is in the open state; and a flexible touch screen display, wherein the flexible touch screen display comprises: a planar portion extending across at least part of the first face, mounted to the first face, and having a first width in a second direction perpendicular to the first direction; and a bendable portion extending from the planar portion to a space between the first side wall and the first structure when in the closed state, wherein the bendable portion comprises a first portion extending from one end of the planar portion and having the same width as the first width, and a second portion extending from the first portion, facing the second plate, and having a second width less than the first width, wherein the second portion of the bendable portion is exposed visually at least in part to the outside of the electronic device through the opening of the second plate, and wherein when the first structure is moved from a closed state to an open state, the first portion of the bendable portion is pulled by a predetermined amount from the space between the first side wall and the first structure, and the first portion of the bendable portion is configured to construct the same plane as the planar portion when the first structure is in the open state. a planar portion extending across at least part of the first face, mounted to the first face, and having a first width in a second direction perpendicular to the first direction; and a bendable portion extending from the planar portion to a space between the first side wall and the first structure when in the closed state, wherein the bendable portion comprises a first portion extending from one end of the planar portion and having the same width as the first width, and a second portion extending from the first portion, facing the second plate, and having a second width less than the first width, wherein the second portion of the bendable portion is exposed visually at least in part to the outside of the electronic device through the opening of the second plate, and wherein when the first structure is moved from a closed state to an open state, the first portion of the bendable portion is pulled by a predetermined amount from the space between the first side wall and the first structure, and the first portion of the bendable portion is configured to construct the same plane as the planar portion when the first structure is in the open state.