A washing machine comprising: a cabinet having a washing space disposed therein and a first opening through which laundry can be inserted into the washing space ; and a door assembly configured to open or close the first opening , wherein the door assembly includes: a door unit including a guide duct having one side forming a second opening and the other side connected to the washing space , the door unit configured to be rotatable with respect to the cabinet ; and a sub-door configured to open or close the second opening ; wherein the door unit comprises a door body corresponding to the first opening and a door glass including an opening in the glass corresponding to the other side of the guide duct , and combined with the door body ; characterised by : a sealing assembly configured to seal the other side of the guide duct , wherein the sealing assembly is configured to seal between the other side of the guide duct and the opening in the glass and comprises: a sealing rubber having elasticity and configured to cover a gap (G) formed between the guide duct and the opening in the glass; and a sealing cap configured to cover the sealing rubber and coupled to at least one of the guide duct and the door glass . a cabinet having a washing space disposed therein and a first opening through which laundry can be inserted into the washing space ; and a door assembly configured to open or close the first opening , wherein the door assembly includes: a door unit including a guide duct having one side forming a second opening and the other side connected to the washing space , the door unit configured to be rotatable with respect to the cabinet ; and a sub-door configured to open or close the second opening ; wherein the door unit comprises a door body corresponding to the first opening and a door glass including an opening in the glass corresponding to the other side of the guide duct , and combined with the door body ; characterised by : a sealing assembly configured to seal the other side of the guide duct , wherein the sealing assembly is configured to seal between the other side of the guide duct and the opening in the glass and comprises: a sealing rubber having elasticity and configured to cover a gap (G) formed between the guide duct and the opening in the glass; and a sealing cap configured to cover the sealing rubber and coupled to at least one of the guide duct and the door glass . a door unit including a guide duct having one side forming a second opening and the other side connected to the washing space , the door unit configured to be rotatable with respect to the cabinet ; and a sub-door configured to open or close the second opening ; wherein the door unit comprises a door body corresponding to the first opening and a door glass including an opening in the glass corresponding to the other side of the guide duct , and combined with the door body ; characterised by : a sealing assembly configured to seal the other side of the guide duct , wherein the sealing assembly is configured to seal between the other side of the guide duct and the opening in the glass and comprises: a sealing rubber having elasticity and configured to cover a gap (G) formed between the guide duct and the opening in the glass; and a sealing cap configured to cover the sealing rubber and coupled to at least one of the guide duct and the door glass . a sealing assembly configured to seal the other side of the guide duct , wherein the sealing assembly is configured to seal between the other side of the guide duct and the opening in the glass and comprises: a sealing rubber having elasticity and configured to cover a gap (G) formed between the guide duct and the opening in the glass; and a sealing cap configured to cover the sealing rubber and coupled to at least one of the guide duct and the door glass . <EOS>