Abstract: A portable vacuum cleaner for use in both dry and wet operations comprising a main body case housing a fan motor and having intake and discharge openings, a dust case having an intake portion and removably attached to the main body case around the intake opening, and a filter housing removably installed in the dust case and having a filter accommodated therein to cover the intake opening with the filter, the filter housing having a tubular portion projecting toward and substantially opposed to the intake portion of the dust case, the tubular portion being closed at the end opposed to the intake portion thereof and formed with apertures in its peripheral wall, the dust case having a partition wall positioned under the intake portion thereof and extending from the intake portion toward the main body case for separating off an interior lower portion of the dust case as a water collection chamber.