A cooking appliance comprising: a main body having a cooking chamber therein, the cooking chamber having an open front side; an electric component space disposed above the cooking chamber and separated from the cooking chamber; a door disposed at a front of the main body and configured to open and close the cooking chamber; a control panel disposed above the door and in front of the electric component space; and a front panel (120, 130) between the door and the cooking chamber and/or between the door and the electric component space; wherein the control panel is spaced apart from the door defining a front space therein between, wherein the front space is in front of the front panel (120, 130); and characterized in that an air guide disposed in the front space and between the door and the control panel and covering at least a portion of the front panel (120, 130) from a front side of the front space; and at least one cover protrusion (250, 250a) protruding from the door into the front space, or at least one cover protrusion (250, 250a) protruding from the control panel into the front space; and wherein the cover protrusion (250, 250a) is configured to guide a position of the air guide by contacting the air guide in a horizontal direction and/or a front-rear direction; and wherein the air guide is coupled to the cover protrusion (250, 250a); and wherein the cover protrusion (250, 250a) includes: a fastening portion coupled to the air guide and in contact with the air guide in a vertical direction; and a guiding portion configured to contact the air guide or a rear side of the air guide in the horizontal direction and/or the front-rear direction to guide the position of the air guide by contacting the air guide in the horizontal direction and/or the front-rear direction. a main body having a cooking chamber therein, the cooking chamber having an open front side; an electric component space disposed above the cooking chamber and separated from the cooking chamber; a door disposed at a front of the main body and configured to open and close the cooking chamber; a control panel disposed above the door and in front of the electric component space; and a front panel (120, 130) between the door and the cooking chamber and/or between the door and the electric component space; wherein the control panel is spaced apart from the door defining a front space therein between, wherein the front space is in front of the front panel (120, 130); and characterized in that an air guide disposed in the front space and between the door and the control panel and covering at least a portion of the front panel (120, 130) from a front side of the front space; and at least one cover protrusion (250, 250a) protruding from the door into the front space, or at least one cover protrusion (250, 250a) protruding from the control panel into the front space; and wherein the cover protrusion (250, 250a) is configured to guide a position of the air guide by contacting the air guide in a horizontal direction and/or a front-rear direction; and wherein the air guide is coupled to the cover protrusion (250, 250a); and a fastening portion coupled to the air guide and in contact with the air guide in a vertical direction; and a guiding portion configured to contact the air guide or a rear side of the air guide in the horizontal direction and/or the front-rear direction to guide the position of the air guide by contacting the air guide in the horizontal direction and/or the front-rear direction.