A mobile terminal comprising: a first frame comprising a front portion and a rear portion; and a second frame couple with the first frame to be capable of switching a state thereof to an extended state by moving in a first direction from the first frame, and to a contracted state by sliding in a second direction opposite to the first direction, wherein the second frame includes a rear portion for at least partially covering a portion of the rear portion of the first frame, wherein the first frame includes: a first rear surface being exposed to an outside rearwardly while in the contracted state and while in the extended state; a second rear surface located frontwardly of the rear portion and not being exposed to the outside while in the contracted state, and wherein at least a portion of the second rear surface is exposed to the outside rearwardly in the extended state; and a third rear surface covered by the rear portion of the second frame in both the contracted state and in the extended state, wherein respective heights of the first rear surface, the second rear surface, and the third rear surface, are different; and wherein the mobile terminal further comprises a display including a fixed portion coupled to a front surface of the first frame and a variable portion extending in the first direction from the fixed portion to surround the second frame and bent toward the rear portion of the second frame a first frame comprising a front portion and a rear portion; and a second frame couple with the first frame to be capable of switching a state thereof to an extended state by moving in a first direction from the first frame, and to a contracted state by sliding in a second direction opposite to the first direction, wherein the second frame includes a rear portion for at least partially covering a portion of the rear portion of the first frame, wherein the first frame includes: a first rear surface being exposed to an outside rearwardly while in the contracted state and while in the extended state; a second rear surface located frontwardly of the rear portion and not being exposed to the outside while in the contracted state, and wherein at least a portion of the second rear surface is exposed to the outside rearwardly in the extended state; and a third rear surface covered by the rear portion of the second frame in both the contracted state and in the extended state, a first rear surface being exposed to an outside rearwardly while in the contracted state and while in the extended state; a second rear surface located frontwardly of the rear portion and not being exposed to the outside while in the contracted state, and wherein at least a portion of the second rear surface is exposed to the outside rearwardly in the extended state; and a third rear surface covered by the rear portion of the second frame in both the contracted state and in the extended state, wherein respective heights of the first rear surface, the second rear surface, and the third rear surface, are different; and wherein the mobile terminal further comprises a display including a fixed portion coupled to a front surface of the first frame and a variable portion extending in the first direction from the fixed portion to surround the second frame and bent toward the rear portion of the second frame