A dust collecting apparatus of a vacuum cleaner is provided. The apparatus includes a dust collection case including a foreign substance discharge port, a cyclone module configured to induce a swirling airflow to separate foreign substances inside the dust collection case, and a discharge door that is movable between an open position for opening the foreign substance discharge port and a blocking position for blocking the foreign substance discharge port, the cyclone module including a fixed portion fixed to the dust collection case, and a rotating portion that is selectively movable when the discharge door is in the open position, and the rotating portion includes a cyclone body including a central cyclone unit and a plurality of edge cyclone units and a rotary shaft arranged on the central cyclone unit such that the cyclone body is rotatable relative to the fixed portion.