A slide opening/closing type mobile device includes a body section including a guide section that has a pair of long holes and is configured so that an interval between the pair of long holes becomes smaller at first, as it goes from one ends towards the other ends of the long holes, and then, becomes larger based on certain starting points; a slider provided with guide rollers movably inserted in the pair of long holes of the guide section in a state of being elastically biased to the outside; a rotation plate rotatably mounted on the slider; and a display section mounted on the rotation plate. The display section is slidable upward and downward with respect to the body section by the slider, and rotates at a predetermined angle by the rotation plate.