There is provided a keypad assembly operating a dome switch of a mobile phone. The keypad assembly includes a keypad disposed on the dome switch and having a plurality of bosses protruded from a position corresponding to the movable contactys, and a plurality of metal keys each disposed on the keypad at a position corresponding to each boss and protruding from a surface of the housing at a desired height, each of the metal keys formed with a numeral and/or character display penetrating through an upper surface therof. Since the metal key is made of metal, it represents a metal feeling, in addition to various colors. Also, since the metal key is slimmed, it minimizes a thickness of the mobile phone. In addition, a process for forming the keypad is minimized thereby to reduce additional cost.