A portable apparatus includes a first case portion including a full keyboard, a second case portion superposed on the first case portion, a slide connection member connecting the first case portion to the second case portion in such a manner that the first case portion is slidable in a direction perpendicular to a length direction of the full keyboard, and a display screen unit directly or indirectly disposed on a front surface of the second case portion, wherein the first and second case portions have a hiding mechanism with which a part of the slide connection member is prevented from being exposed to the outside when the first case portion is maximally slid out with respect to the second case portion.