An oven is provided to prevent heat transfer through a support unit between cooking chambers by including an insulation structure in the support unit supporting a partition dividing the cooking space into a plurality of cooking chambers. An oven includes a partition(40) and a support unit(50). The partition divides a cooking space into a plurality of cooking chambers. The support unit supports the partition. The support unit includes a support member(51) and an air passage(60). The support member supports the partition. The air passage is formed in the interior of the support member. The support member is formed along a rear surface plate and both side surface plates of the cooking space. A blowing fan communicated with the air passage is installed on the outer side of the rear surface plate so that ambient air can be compulsorily flown through the air passage.
