A vacuum cleaner including a cleaner body; and a dust collector provided in the cleaner body, wherein the dust collector includes a first cyclone provided within an outer case to filter foreign matter and dust from air introduced into the dust collector; a second cyclone accommodated within the first cyclone to separate fine dust from the air introduced into the first cyclone; and a rotatable shell provided at a lower side of and surrounding the first cyclone so as to define a first storage section configured to collect foreign matter and dust filtered by the first cyclone between the rotatable shell and the outer case, wherein the rotatable shell includes a skirt having a plurality of steps arranged along a circumference of the rotatable shell.