A cooking appliance is provided. The cooking appliance may include a convection fan installed in a cooking chamber; a fan motor installed outside of the cooking chamber and configured to rotate the convection fan; a cooling fan installed outside of the cooking chamber and rotated by the fan motor to generate air currents to flow to the fan motor; a duct that forms a passage that connects an inside of the cooking chamber and the outside of the cooking chamber, wherein an opening in the duct is opened toward the cooling fan; and a blocking member installed outside of the cooking chamber and configured to block a path of air flow from the opening to the cooling fan.