A dryer for clothes, comprising: a cabinet (12,13); a drying drum accommodated in the cabinet and configured to receive an object to be dried; a suction passage for supplying hot air into the drying drum; a heating unit disposed on one position of the suction passage and configured to heat the air introduced into the suction passage at a high temperature; an exhaust passage configured to allow hot air discharged from the drying drum to flow therethrough; a blower mounted on one position of the exhaust passage and configured to forcibly blow the air within the drying drum; a lint filter mounted on the other position of the exhaust passage; a guide duct defining a portion of the exhaust passage to accommodate the lint filter therein; and a blocking member disposed at a position where the air discharged from the drying drum flows, the blocking member configured to filter foreign substances contained in the air discharged from the drying drum before the air discharged from the drying drum is guided to the guide duct, wherein the blocking member comprises: a plurality of blocking ribs; and a plurality of partition ribs extending from a first edge to a second edge of the blocking member in a horizontal direction and vertically spaced a predetermined distance from each other, the plurality of partition ribs configured to connect the plurality of blocking ribs to each other, wherein the blocking ribs are spaced a predetermined distance from each other in said horizontal direction; wherein the partition ribs and the blocking ribs are disposed to define a vertical surface of the blocking member that extends in said horizontal direction, and wherein one surface of each of the blocking ribs defines an inclination surface that is inclined at an acute angle (θ), which is less than an angle of 90 degrees, with respect to the vertical surface. a cabinet (12,13); a drying drum accommodated in the cabinet and configured to receive an object to be dried; a suction passage for supplying hot air into the drying drum; a heating unit disposed on one position of the suction passage and configured to heat the air introduced into the suction passage at a high temperature; an exhaust passage configured to allow hot air discharged from the drying drum to flow therethrough; a blower mounted on one position of the exhaust passage and configured to forcibly blow the air within the drying drum; a lint filter mounted on the other position of the exhaust passage; a guide duct defining a portion of the exhaust passage to accommodate the lint filter therein; and a blocking member disposed at a position where the air discharged from the drying drum flows, the blocking member configured to filter foreign substances contained in the air discharged from the drying drum before the air discharged from the drying drum is guided to the guide duct, wherein the blocking member comprises: a plurality of blocking ribs; and a plurality of partition ribs extending from a first edge to a second edge of the blocking member in a horizontal direction and vertically spaced a predetermined distance from each other, the plurality of partition ribs configured to connect the plurality of blocking ribs to each other, a plurality of blocking ribs; and a plurality of partition ribs extending from a first edge to a second edge of the blocking member in a horizontal direction and vertically spaced a predetermined distance from each other, the plurality of partition ribs configured to connect the plurality of blocking ribs to each other, wherein the blocking ribs are spaced a predetermined distance from each other in said horizontal direction; wherein the partition ribs and the blocking ribs are disposed to define a vertical surface of the blocking member that extends in said horizontal direction, and wherein one surface of each of the blocking ribs defines an inclination surface that is inclined at an acute angle (θ), which is less than an angle of 90 degrees, with respect to the vertical surface.