A dryer, comprising: a cabinet that forms an exterior; a drum that is provided inside the cabinet and houses a drying target; a base that includes a motor rotating the drum and a suction fan that moves air in the inside of the drum; a cyclone part that is disposed between the drum and the suction fan and guides the cyclone flow of the air discharged from the drum; and a foreign material case that stores the foreign materials separated from the air by the cyclone flow; a connection duct that moves air discharged from the drum; and a guide unit that is coupled to the connection duct and guides air passing through the connection duct to be introduced into the cyclone part; an air introduction part that extends in a tangential direction of the cyclone part from the guide unit and introduces air into the cyclone part; wherein the cyclone part includes: an air discharge hole disposed at the inlet side of the suction fan and formed on one surface of the cyclone part for discharging air without foreign materials, a filter member that filters the foreign materials and includes a first end portion that is coupled to the air discharge hole and a second end portion that extends to the inner direction of the cyclone part from the first end portion; the dryer being characterized by its cyclone part further comprising a foreign material discharge part that extends in a tangential direction of the cyclone part for discharging foreign materials separated from the air to the foreign material case, and by the cross sectional area of the filter member gradually decreasing from the first end portion to the second end portion. a cabinet that forms an exterior; a drum that is provided inside the cabinet and houses a drying target; a base that includes a motor rotating the drum and a suction fan that moves air in the inside of the drum; a cyclone part that is disposed between the drum and the suction fan and guides the cyclone flow of the air discharged from the drum; and a foreign material case that stores the foreign materials separated from the air by the cyclone flow; a connection duct that moves air discharged from the drum; and a guide unit that is coupled to the connection duct and guides air passing through the connection duct to be introduced into the cyclone part; an air introduction part that extends in a tangential direction of the cyclone part from the guide unit and introduces air into the cyclone part; wherein the cyclone part includes: an air discharge hole disposed at the inlet side of the suction fan and formed on one surface of the cyclone part for discharging air without foreign materials, a filter member that filters the foreign materials and includes a first end portion that is coupled to the air discharge hole and a second end portion that extends to the inner direction of the cyclone part from the first end portion; the dryer being characterized by its cyclone part further comprising a foreign material discharge part that extends in a tangential direction of the cyclone part for discharging foreign materials separated from the air to the foreign material case, and by the cross sectional area of the filter member gradually decreasing from the first end portion to the second end portion. an air discharge hole disposed at the inlet side of the suction fan and formed on one surface of the cyclone part for discharging air without foreign materials, a filter member that filters the foreign materials and includes a first end portion that is coupled to the air discharge hole and a second end portion that extends to the inner direction of the cyclone part from the first end portion; the dryer being characterized by its cyclone part further comprising a foreign material discharge part that extends in a tangential direction of the cyclone part for discharging foreign materials separated from the air to the foreign material case, and by the cross sectional area of the filter member gradually decreasing from the first end portion to the second end portion.