An oven comprising: a main body; a cooking compartment provided inside the main body with an open front; a door provided to open or close the cooking compartment, wherein the door comprises: a front glass installed on the front side; a rear glass installed on the rear side; at least one middle glass (43, 43a, 43b) arranged between the front glass and the rear glass to form a plurality of air flow paths (P1, P2, P3); a door handle coupled to an upper portion of the front glass; support frames arranged on both sides of the door to fix the front glass, the rear glass, and the at least one middle glass (43, 43a, 43b); characterized by a door duct (100, 200, 300, 400) coupled to an upper portion of the support frame, arranged on the top of the door and comprising a guide (120, 220, 320, 420) arranged between the front glass and the at least one middle glass (43, 43a, 43b), wherein the guide (120, 220, 320, 420) forms a guide path (121, 221, 321, 323, 421) for guiding a portion of the air in the air flow path that is adjacent to the front glass to the upper portion of the front glass, wherein the door duct (100, 200, 300, 400) further comprises a plurality of discharging holes (140, 240, 250, 340, 350, 440, 450) through which the rest of the air in the plurality of air flow paths (P1, P2, P3) is discharged out of the door towards the cooking compartment. a main body; a cooking compartment provided inside the main body with an open front; a door provided to open or close the cooking compartment, wherein the door comprises: a front glass installed on the front side; a rear glass installed on the rear side; at least one middle glass (43, 43a, 43b) arranged between the front glass and the rear glass to form a plurality of air flow paths (P1, P2, P3); a door handle coupled to an upper portion of the front glass; support frames arranged on both sides of the door to fix the front glass, the rear glass, and the at least one middle glass (43, 43a, 43b); characterized by a door duct (100, 200, 300, 400) coupled to an upper portion of the support frame, arranged on the top of the door and comprising a guide (120, 220, 320, 420) arranged between the front glass and the at least one middle glass (43, 43a, 43b), wherein the guide (120, 220, 320, 420) forms a guide path (121, 221, 321, 323, 421) for guiding a portion of the air in the air flow path that is adjacent to the front glass to the upper portion of the front glass, wherein the door duct (100, 200, 300, 400) further comprises a plurality of discharging holes (140, 240, 250, 340, 350, 440, 450) through which the rest of the air in the plurality of air flow paths (P1, P2, P3) is discharged out of the door towards the cooking compartment. a front glass installed on the front side; a rear glass installed on the rear side; at least one middle glass (43, 43a, 43b) arranged between the front glass and the rear glass to form a plurality of air flow paths (P1, P2, P3); a door handle coupled to an upper portion of the front glass; support frames arranged on both sides of the door to fix the front glass, the rear glass, and the at least one middle glass (43, 43a, 43b); characterized by a door duct (100, 200, 300, 400) coupled to an upper portion of the support frame, arranged on the top of the door and comprising a guide (120, 220, 320, 420) arranged between the front glass and the at least one middle glass (43, 43a, 43b), wherein the guide (120, 220, 320, 420) forms a guide path (121, 221, 321, 323, 421) for guiding a portion of the air in the air flow path that is adjacent to the front glass to the upper portion of the front glass, wherein the door duct (100, 200, 300, 400) further comprises a plurality of discharging holes (140, 240, 250, 340, 350, 440, 450) through which the rest of the air in the plurality of air flow paths (P1, P2, P3) is discharged out of the door towards the cooking compartment.