A cooking appliance comprising: a cavity to define a cooking chamber ; a door to open and close the cooking chamber ; a partition plate to partition the cavity into a first chamber and a second chamber , the partition plate facing the door in the closed state, wherein the door closes the first chamber , the partition plate including a front plate , an extension part extending from the front plate toward a rear wall of the cavity ; a burner provided in the second chamber to burn gas, thereby generating flame; and a burner cover to define a combustion chamber (C) in which the burner is disposed, within the second chamber , a fan provided in the second chamber to allow heated air to flow, wherein the burner cover partitions the second chamber into the combustion chamber (C) and an exhaust chamber (P1) disposed at an outside of the combustion chamber, the fan being disposed in the exhaust chamber (P1), wherein an air within the first chamber is introduced into the combustion chamber (C) within the second chamber through an air suction hole defined on the front plate , and wherein the air heated by the burner in the combustion chamber (C) within the second chamber flows into the exhaust chamber (P1) and is discharged into the first chamber through an air discharge hole defined on the extension part and/or the front plate , characterized in that the burner cover includes: a first cover covering the burner at a front side of the burner ; and a second cover covering the burner at a rear side of the burner , wherein the exhaust chamber (P1) is defined between the second cover and the rear wall of the cavity , wherein the partition plate is coupled to the rear wall of the cavity , wherein the second chamber is defined between the partition plate and the rear wall of the cavity . a cavity to define a cooking chamber ; a door to open and close the cooking chamber ; a partition plate to partition the cavity into a first chamber and a second chamber , the partition plate facing the door in the closed state, wherein the door closes the first chamber , the partition plate including a front plate , an extension part extending from the front plate toward a rear wall of the cavity ; a burner provided in the second chamber to burn gas, thereby generating flame; and a burner cover to define a combustion chamber (C) in which the burner is disposed, within the second chamber , a fan provided in the second chamber to allow heated air to flow, wherein the burner cover partitions the second chamber into the combustion chamber (C) and an exhaust chamber (P1) disposed at an outside of the combustion chamber, the fan being disposed in the exhaust chamber (P1), wherein an air within the first chamber is introduced into the combustion chamber (C) within the second chamber through an air suction hole defined on the front plate , and wherein the air heated by the burner in the combustion chamber (C) within the second chamber flows into the exhaust chamber (P1) and is discharged into the first chamber through an air discharge hole defined on the extension part and/or the front plate , characterized in that the burner cover includes: a first cover covering the burner at a front side of the burner ; and a second cover covering the burner at a rear side of the burner , wherein the exhaust chamber (P1) is defined between the second cover and the rear wall of the cavity , wherein the partition plate is coupled to the rear wall of the cavity , wherein the second chamber is defined between the partition plate and the rear wall of the cavity . a first cover covering the burner at a front side of the burner ; and a second cover covering the burner at a rear side of the burner , wherein the exhaust chamber (P1) is defined between the second cover and the rear wall of the cavity , wherein the partition plate is coupled to the rear wall of the cavity , wherein the second chamber is defined between the partition plate and the rear wall of the cavity . <EOS>