A dust collector includes a centrifugal separator, a discharge unit having a filtered dust collecting space provided with a discharge unit discharge hole at a discharging side of the centrifugal separator and an intake passage communicating with a bottom of the discharge unit discharge hole, a filter unit provided with a filter member and mounted at the discharge unit discharge hole, and a sealing member including a dust removing device mounted on the filter unit and a dust container formed on a bottom surface of the centrifugal separator, wherein the sealing member opens the filtered dust collecting space and the intake passage by means of the weight thereof and closes the filtered dust collecting space and the intake passage by means of negative pressure.