An input unit of the portable terminal for inputting information to the portable terminal such as a keypad is provided to generate input signal according to a horizontal movement of a slide pad and to implement an input function suitable for each operation mode of the terminal. At least one or more key groove(129a) is formed on the outer circumference of a terminal. A pressing sensing part is installed in a key groove. A slide pad is inserted within the key groove, installed on the top of the pressing sensing part and is parallel moved. The slide pad generates input signal according to operation of the pressing sensing part and is horizontally moved.
