A vacuum cleaner with a dust collecting device comprising: a case forming an outer appearance of the dust collecting device ; a first cyclone , installed within the case , being configured to separate dust from air with foreign objects introduced from one side thereof and discharge the separated dust to a first dust storage unit through an outlet provided at an opposite side thereof; a plurality of second cyclones , arranged along an inner surface of the case , being configured to separate, from the air which has passed through the first cyclone , finer dust that is not separated and discharge the separated finer dust to a second dust storage unit ; and a lower cover unit rotatably coupled to one side of the case by a hinge so as to form a bottom surface of the first dust storage unit and the second dust storage unit , being configured to be rotatable by the hinge to simultaneously open/close the first dust storage unit and the second storage unit such that the collected dust and finer dust are simultaneously discharged, characterized in that the first cyclone comprises: a housing , eccentric from the center of the case , having said outlet formed thereon, at an upper portion, to communicate with the first dust storage unit ; and a mesh filter , installed within the housing to extend parallel with the housing, for separating dust from air introduced to the interior of the housing , wherein an inlet of the dust collecting device is formed on the lower cover unit to communicate with an internal space of the first cyclone . a case forming an outer appearance of the dust collecting device ; a first cyclone , installed within the case , being configured to separate dust from air with foreign objects introduced from one side thereof and discharge the separated dust to a first dust storage unit through an outlet provided at an opposite side thereof; a plurality of second cyclones , arranged along an inner surface of the case , being configured to separate, from the air which has passed through the first cyclone , finer dust that is not separated and discharge the separated finer dust to a second dust storage unit ; and a lower cover unit rotatably coupled to one side of the case by a hinge so as to form a bottom surface of the first dust storage unit and the second dust storage unit , being configured to be rotatable by the hinge to simultaneously open/close the first dust storage unit and the second storage unit such that the collected dust and finer dust are simultaneously discharged, characterized in that the first cyclone comprises: a housing , eccentric from the center of the case , having said outlet formed thereon, at an upper portion, to communicate with the first dust storage unit ; and a mesh filter , installed within the housing to extend parallel with the housing, for separating dust from air introduced to the interior of the housing , wherein an inlet of the dust collecting device is formed on the lower cover unit to communicate with an internal space of the first cyclone . a housing , eccentric from the center of the case , having said outlet formed thereon, at an upper portion, to communicate with the first dust storage unit ; and a mesh filter , installed within the housing to extend parallel with the housing, for separating dust from air introduced to the interior of the housing , wherein an inlet of the dust collecting device is formed on the lower cover unit to communicate with an internal space of the first cyclone . <EOS>