A sliding/swing-type portable apparatus having a self-retaining function includes a main body; a battery cover coupled to the bottom surface of the main body in a predetermined position so that it can rotate about a first hinge axis toward or away from the main body and provided with a folding force, at less than a first angle relative to the bottom surface of the main body, in such a direction that it is folded on the main body, an unfolding force at the first angle or more, and a retaining force at a second angle for retaining the main body in an upright position, at a slant; and a battery pack attached to and detached from the battery cover.