a first frame;

a second frame movably coupled to the first frame, and configured to move in a first direction with respect to the first frame or in a second direction opposite to the first direction so as to form a predetermined stroke;

a third frame movably coupled to the second frame and configured to move in the first direction or the second direction with respect to the second frame;

a flexible display including a first region disposed at a front surface of the mobile terminal and coupled to the first frame, a second region disposed at a rear surface of the mobile terminal and coupled to the third frame, and a third region formed to extend between the first and second regions, wherein the third region is wound on the second frame and is selectively disposed on the front surface of the mobile terminal or the rear surface of the mobile terminal;

a driving unit configured to move the second frame in the first or second direction with respect to the first frame and to move the third frame in the first or second direction with respect to the second frame;

a detection device that includes at least one capacitor comprising conductors respectively arranged in the first and second frames to face each other and that measures a change in capacitance generated in conductors provided to the first and second frames by movement of the second frame moving in the first or second direction; and

a controller configured to determine the amount of movement of the second frame based on a change in the generated capacitance and control operation of the mobile terminal based on the amount of movement of the second frame measured by the detection device,

wherein the conductors are configured to have an overlap area that is changed in size while the second frame relatively moves with respect to the first frame to change the capacitance.