A cooking appliance for cooking food, comprising: a main body having a cooking chamber formed therein; a rear surface unit configured to define a rear boundary surface of the cooking chamber, a lower surface unit configured to define a lower boundary surface of the cooking chamber, and a side surface unit configured to define a side boundary surface of the cooking chamber; a lower case provided below the lower surface unit and configured to form an accommodation space therein; a lower heater installed in the accommodation space and configured to generate heat; a first discharge port (a) formed at the lower case for discharging heat; a second discharge port (b) formed at the cooking chamber; and a flow path connection member configured to form a flow path guide (c) for guiding heated air discharged through the first discharge port (a) toward the second discharge port (b), wherein the flow path connection member includes a duct unit (331, 333) provided outside the cooking chamber and configured to connect the first and second discharge ports (a, b) to each other, wherein the duct unit (331, 333) includes: a first duct unit configured to form an outer wall at a peripheral portion of the first discharge port (a), the first duct unit being pressed against the lower case; and a second duct unit configured to form an outer wall at a peripheral portion of the second discharge port (b), the second duct unit being pressed against the side surface unit; and wherein the flow path guide (c) is formed in a space surrounded by the duct units (331, 333); characterized in that the cooking appliance further comprises: a heating unit provided inside the cooking chamber and configured to generate a circulation flow of heated air circulating inside the cooking chamber, wherein heated air discharged into the cooking chamber through the second discharge port (b) combines with the circulation flow of the heated air generated by the heating unit and circulates inside the cooking chamber. a main body having a cooking chamber formed therein; a rear surface unit configured to define a rear boundary surface of the cooking chamber, a lower surface unit configured to define a lower boundary surface of the cooking chamber, and a side surface unit configured to define a side boundary surface of the cooking chamber; a lower case provided below the lower surface unit and configured to form an accommodation space therein; a lower heater installed in the accommodation space and configured to generate heat; a first discharge port (a) formed at the lower case for discharging heat; a second discharge port (b) formed at the cooking chamber; and a flow path connection member configured to form a flow path guide (c) for guiding heated air discharged through the first discharge port (a) toward the second discharge port (b), wherein the flow path connection member includes a duct unit (331, 333) provided outside the cooking chamber and configured to connect the first and second discharge ports (a, b) to each other, wherein the duct unit (331, 333) includes: a first duct unit configured to form an outer wall at a peripheral portion of the first discharge port (a), the first duct unit being pressed against the lower case; and a second duct unit configured to form an outer wall at a peripheral portion of the second discharge port (b), the second duct unit being pressed against the side surface unit; and wherein the flow path guide (c) is formed in a space surrounded by the duct units (331, 333); a first duct unit configured to form an outer wall at a peripheral portion of the first discharge port (a), the first duct unit being pressed against the lower case; and a second duct unit configured to form an outer wall at a peripheral portion of the second discharge port (b), the second duct unit being pressed against the side surface unit; and wherein the flow path guide (c) is formed in a space surrounded by the duct units (331, 333);