Provided is a mobile terminal comprising: a case comprising a button hole; a main board mounted within the case; a button module which is exposed to the outside through the button hole; a sealing rubber comprising an opening into which the button module is inserted; a first waterproof tape in the form of a closed curve, which joins the sealing rubber and the button module; and a second waterproof tape in the form of a closed curve, which joins the sealing rubber and the case. The button module comprises: a fingerprint recognition module for recognizing a user's fingerprint when touched by a user's finger; a switch for generating a signal when pressed; and a flexible board comprising a mounting portion for mounting the fingerprint recognition module and the switch therein, a contact portion contacting the main board, and a connection portion for connecting the mounting portion and the contact portion.