A multi-cyclone collector includes a suction port for sucking an air flow including contaminating particles, a cyclone accommodation chamber allowing the air flow sucked through the suction port to be guided thereinto, a plurality of cyclones each accommodated in the cyclone accommodation chamber, for transforming the air flow taken in to a downward swirl flow, separating the contaminating particles, then reversing the swirl flow to the upward swirl flow and releasing the upward swirl flow as a purified air flow, a cyclone exit chamber provided above the cyclone accommodation chamber, that allows the purified air flow from the cyclones to be guided thereinto, and a drain discharge chamber provided below the cyclone accommodation chamber, for collecting the contaminating particles separated by the cyclones.