A mobile terminal comprising: a first frame; a second frame slidably coupled to the first frame and configured to: move with respect to the first frame in a first direction while the mobile terminal is in a first state; and move with respect to the first frame in a second direction while the mobile terminal is in a second state, the second direction being opposite to the first direction; a third frame configured to move in the first direction or the second direction with respect to the second frame; a flexible display comprising: a first region coupled to the first frame; a second region coupled to the third frame; and a third region positioned between the first region and the second region and configured to curve around the second frame; and a display frame coupled to a rear surface of the third region of the flexible display, wherein the second frame comprises a side portion positioned at an end thereof facing in a third direction perpendicular to the first direction and a guide rail (1027c, 1027d) formed on the side portion, wherein the display frame comprises a guide hook positioned at an end thereof and inserted into the guide rail (1027c, 1027d), and wherein the side portion comprises: a rear side portion; a front side portion arranged in front of the rear side portion; and an opening portion arranged on the front side portion, and covered by the end of the display frame. a first frame; a second frame slidably coupled to the first frame and configured to: move with respect to the first frame in a first direction while the mobile terminal is in a first state; and move with respect to the first frame in a second direction while the mobile terminal is in a second state, the second direction being opposite to the first direction; move with respect to the first frame in a first direction while the mobile terminal is in a first state; and move with respect to the first frame in a second direction while the mobile terminal is in a second state, the second direction being opposite to the first direction; a third frame configured to move in the first direction or the second direction with respect to the second frame; a flexible display comprising: a first region coupled to the first frame; a second region coupled to the third frame; and a third region positioned between the first region and the second region and configured to curve around the second frame; and a first region coupled to the first frame; a second region coupled to the third frame; and a third region positioned between the first region and the second region and configured to curve around the second frame; and a display frame coupled to a rear surface of the third region of the flexible display, wherein the second frame comprises a side portion positioned at an end thereof facing in a third direction perpendicular to the first direction and a guide rail (1027c, 1027d) formed on the side portion, wherein the display frame comprises a guide hook positioned at an end thereof and inserted into the guide rail (1027c, 1027d), and wherein the side portion comprises: a rear side portion; a front side portion arranged in front of the rear side portion; and an opening portion arranged on the front side portion, and covered by the end of the display frame. a rear side portion; a front side portion arranged in front of the rear side portion; and an opening portion arranged on the front side portion, and covered by the end of the display frame.