A touch input device includes a mounting unit in which a mounting groove is formed at an inner side of the mounting unit, and a touch unit accommodated in the mounting groove and installed to be detachable from the mounting unit, wherein the touch unit comprises a first touch portion and a second touch portion, which are provided on different surfaces of the touch unit and allow a user to input a touch gesture, and the touch unit is selectively coupled to the mounting unit to allow the first touch portion to face an upper side or to allow the second touch portion to face the upper side.