Vacuum cleaner having detachable dust separating unit

A vacuum cleaner having a detachable dust separating unit (50) is disclosed. The vacuum cleaner includes a cleaner body (10) having a first opening (11a) to open a portion of a first surface thereof and a second opening (11b) to open a portion of a second surface thereof, a dust separating unit (50) to separate a dust from an air, and a seating part (80) formed in the cleaner body (10) to detachably mount the dust separating unit (50) on the cleaner body (10). The dust separating unit (50) forms a portion of an outward appearance of the cleaner body (10) while closing up the first and the second openings (11a, 11b) of the cleaner body (10) when the dust separating unit (50) is mounted on the seating part (80).