A vacuum cleaner comprising: an electric air blower; a dust separator placed at an upstream side of the electric air blower for taking in dust-containing air sucked by the electric air blower as a whirling air current and separating the dust from the air using a cylindrical filtration filter; a dust accommodating section for accommodating the dust separated by the dust separator, the dust accommodating section being disposed below the dust separator, the filtration filter is provided with a plurality of through-holes penetrating between an upstream surface at an upstream side and a downstream surface at a downstream side, wherein the filtration filter is disposed so that the central axis of the through-hole is inclined in substantially an opposite direction to a moving direction of the whirling air current flowing along the upstream surface of the filtration filter, characterized in that the through-holes are formed by carrying out an etching processing such that a position of a first etched hole formed in the upstream surface and a position of a second etched hole formed in the downstream surface are shifted from each other in a surface direction of the filtration filter, the first etched hole and the second etched hole are combined with each other so that a central axis of the through-holes linking a center point of the first etched hole to a center point of the second etched hole has an inclined angle with respect to a normal line of the surface of the filtration filter, the first etched hole provided with a bottom surface by carrying out the etching processing, whereby suched grain dusts having heavier specific gravity collide with the bottom surface of the first etched hole and are inhibited from being stuck in the through-holes. an electric air blower; a dust separator placed at an upstream side of the electric air blower for taking in dust-containing air sucked by the electric air blower as a whirling air current and separating the dust from the air using a cylindrical filtration filter; a dust accommodating section for accommodating the dust separated by the dust separator, the dust accommodating section being disposed below the dust separator, the filtration filter is provided with a plurality of through-holes penetrating between an upstream surface at an upstream side and a downstream surface at a downstream side, wherein the filtration filter is disposed so that the central axis of the through-hole is inclined in substantially an opposite direction to a moving direction of the whirling air current flowing along the upstream surface of the filtration filter, characterized in that the through-holes are formed by carrying out an etching processing such that a position of a first etched hole formed in the upstream surface and a position of a second etched hole formed in the downstream surface are shifted from each other in a surface direction of the filtration filter, the first etched hole and the second etched hole are combined with each other so that a central axis of the through-holes linking a center point of the first etched hole to a center point of the second etched hole has an inclined angle with respect to a normal line of the surface of the filtration filter, the first etched hole provided with a bottom surface by carrying out the etching processing, whereby suched grain dusts having heavier specific gravity collide with the bottom surface of the first etched hole and are inhibited from being stuck in the through-holes.