Patent ID: 8443486

Claim:
A vacuum cleaner comprising; a dust separator upstream of the electric air blower, the dust separator configured to receive dust-containing air sucked by the electric air blower and generate a whirling air current, the dust separator including a substantially cylindrical filtration filter configured to separate dust from the dust-containing air; and a dust accommodating section arranged under the dust separator and configured to accommodate dust separated by the dust separator, wherein the filtration filter is formed by shaping a flat plate into a substantially cylindrical shape, the flat plate having a plurality of through-holes penetrating between a front surface and a rear surface, each through-hole having a central axis forming a vector that is inclined with respect to a normal line of the front surface, such that the vector has an X-component and a Y-component perpendicular to said X-component and wherein the X-component is substantially opposite a direction of the whirling air current flowing along an upstream surface of the substantially cylindrical filtration filter.