Disclosed herein is a door of an electric oven, which has an improved configuration to prevent the escape of heat from a cooking compartment to the outside during cooking or self-cleaning of the cooking compartment. The door, which serves to selectively open or close a cooking compartment of an electric oven, includes a front glass installed to a front surface, a rear glass installed behind the front glass, and a porous plate interposed between the front glass and the rear glass. The porous plate serves to prevent the escape of heat from the cooking compartment to the outside and includes a plurality of view holes to enable observation of the cooking compartment from the outside.