An oven in which a cooking space in a cooking chamber is dividable into a plurality of individual cooking spaces by a partition member. The oven includes a door assembly including a main door rotatably combined with a main body and provided with a plurality of openings corresponding to the respective plurality of individual cooking spaces and a plurality of individual doors rotatably combined with the main body to open and close the respective plurality of openings. The door assembly may selectively open and close the entirety of the cooking space or the respective plurality of individual cooking spaces, and thus a heat loss or danger of burn generated due to opening and closing the main door when only the individual cooking space is used may be prevented.