A cooking appliance comprising a cabinet defining an external appearance of the cooking appliance, a top plate disposed at a top of the cabinet, the top plate being provided with a first cooking unit for performing cooking using a heat source, and a second cooking unit provided in the cabinet for performing cooking using a heat source, the cooking appliance further comprising: a control panel disposed at a front of the cabinet, the control panel being provided therein with at least one air introduction hole; a controller disposed at a rear of the control panel for controlling the first cooking unit and the second cooking unit; a first guide member disposed in the control panel for guiding external air introduced through the at least one air introduction hole to a rear of the cooking appliance, wherein the controller is disposed in front of the first guide member in the control panel; and a heat dissipation fan disposed between the control panel and a rear wall of the cabinet, wherein a direction in which external air is introduced into the cooking appliance through the at least one air introduction hole is different from a direction in which the external air is discharged from the cooking appliance, characterized in that the first guide member comprises: two horizontal parts extending in a width direction; two vertical parts extending downward from respective facing ends of the two horizontal parts; and a blocking part disposed between the two vertical parts for covering at least a portion of a rear end of each of the two vertical parts; the controller is disposed between the two vertical parts; a first horizontal flow channel is defined between the two horizontal parts and an upper wall of the control panel; a first vertical flow channel is defined between the two vertical parts, the controller being disposed in the first vertical flow channel; and the external air introduced through the at least one air introduction hole is introduced into the first vertical flow channel via the first horizontal flow channel. a control panel disposed at a front of the cabinet, the control panel being provided therein with at least one air introduction hole; a controller disposed at a rear of the control panel for controlling the first cooking unit and the second cooking unit; a first guide member disposed in the control panel for guiding external air introduced through the at least one air introduction hole to a rear of the cooking appliance, wherein the controller is disposed in front of the first guide member in the control panel; and a heat dissipation fan disposed between the control panel and a rear wall of the cabinet, wherein a direction in which external air is introduced into the cooking appliance through the at least one air introduction hole is different from a direction in which the external air is discharged from the cooking appliance, characterized in that the first guide member comprises: two horizontal parts extending in a width direction; two vertical parts extending downward from respective facing ends of the two horizontal parts; and a blocking part disposed between the two vertical parts for covering at least a portion of a rear end of each of the two vertical parts; the controller is disposed between the two vertical parts; a first horizontal flow channel is defined between the two horizontal parts and an upper wall of the control panel; a first vertical flow channel is defined between the two vertical parts, the controller being disposed in the first vertical flow channel; and the external air introduced through the at least one air introduction hole is introduced into the first vertical flow channel via the first horizontal flow channel.