A dishwasher comprising: a tub having a washing space therein; a door , disposed at a front side of the tub , configured to open or close the washing space ; and a drying device configured to dry the washing space , wherein the drying device comprises: a condensing duct , disposed outside the tub , configured to communicate with an inlet port (H1) formed in the tub and face an outer surface of the tub , wherein the condensing duct extends in a vertical direction and a first direction which intersects the vertical direction; and a fan configured to allow air in the condensing duct to flow, characterized in that the condensing duct comprises: an upstream portion configured to communicate with the inlet port (H1); a downstream portion configured to communicate with the upstream portion and comprising a bent portion (BP) bent to descend and then ascend in the vertical direction of the condensing duct , and inhibiting a condensate water from flowing into a downstream side of the condensing duct ; and a rib (RB) formed inside the bent portion (BP), wherein the rib (RB) traverses the bent portion (BP) and protrudes in a second direction which intersects the vertical direction and the first direction. a tub having a washing space therein; a door , disposed at a front side of the tub , configured to open or close the washing space ; and a drying device configured to dry the washing space , wherein the drying device comprises: a condensing duct , disposed outside the tub , configured to communicate with an inlet port (H1) formed in the tub and face an outer surface of the tub , wherein the condensing duct extends in a vertical direction and a first direction which intersects the vertical direction; and a fan configured to allow air in the condensing duct to flow, characterized in that the condensing duct comprises: an upstream portion configured to communicate with the inlet port (H1); a downstream portion configured to communicate with the upstream portion and comprising a bent portion (BP) bent to descend and then ascend in the vertical direction of the condensing duct , and inhibiting a condensate water from flowing into a downstream side of the condensing duct ; and a rib (RB) formed inside the bent portion (BP), wherein the rib (RB) traverses the bent portion (BP) and protrudes in a second direction which intersects the vertical direction and the first direction. a condensing duct , disposed outside the tub , configured to communicate with an inlet port (H1) formed in the tub and face an outer surface of the tub , wherein the condensing duct extends in a vertical direction and a first direction which intersects the vertical direction; and a fan configured to allow air in the condensing duct to flow, characterized in that the condensing duct comprises: an upstream portion configured to communicate with the inlet port (H1); a downstream portion configured to communicate with the upstream portion and comprising a bent portion (BP) bent to descend and then ascend in the vertical direction of the condensing duct , and inhibiting a condensate water from flowing into a downstream side of the condensing duct ; and a rib (RB) formed inside the bent portion (BP), wherein the rib (RB) traverses the bent portion (BP) and protrudes in a second direction which intersects the vertical direction and the first direction. an upstream portion configured to communicate with the inlet port (H1); a downstream portion configured to communicate with the upstream portion and comprising a bent portion (BP) bent to descend and then ascend in the vertical direction of the condensing duct , and inhibiting a condensate water from flowing into a downstream side of the condensing duct ; and a rib (RB) formed inside the bent portion (BP), wherein the rib (RB) traverses the bent portion (BP) and protrudes in a second direction which intersects the vertical direction and the first direction. <EOS>