Disclosed is a mobile communication device comprising a slide cover being longitudinally slid towards or away from a main body of the mobile communication device according to use of the mobile communication device. The mobile communication device includes the main body having a liquid crystal display and guide holes formed at both sides of the liquid crystal display; a slide cover including a speaker, and being provided on a front surface of the liquid crystal display so as to be slid along a longitudinal direction of the main body, thus exposing the entire or a portion of the liquid crystal display; a pop-up module being connected to the slide cover, and being inserted into the guide holes so that the slide cover is slid along the front surface of the liquid crystal display of the main body; and a side grip provided at a side surface of the main body so as to fix or release a position of the pop-up module.