Disclosed herein is an oven having a display module provided at a front of an electrical compartment, an outside air inlet unit formed at a body such that the air of the outside of the body may be inlet from an upper side of the display module, and a guide member provided at the electrical compartment as to guide the air inlet through the outside air inlet unit to move from the upper portion of the display module to a lower portion of the display module, thereby increasing cooling efficiency of the display module. In addition, the amount of the exhaust air of a cooking compartment may be adjusted while provided with a bypass hole to inlet the air of a cooling path into an exhaust path, and an opening/closing apparatus to open/close the bypass hole.