Oven

An oven comprising:

• a main body comprising a cooking chamber;
• a door rotatably coupled to the main body to open or close the cooking chamber, the door comprising a locker holder;
• and
• a door locking device configured to lock the door not to be open with respect to the main body,
• the door locking device comprising:
• a cam configured to be rotatable, the cam comprising:
• a plurality of first contact parts;
• and
• a plurality of second contact parts;
• a lock releasing guide configured to be linearly movable to selectively come into contact with the plurality of first contact parts;
• and
• a locker couplable to the locker holder of the door to lock the door, and configured to come into contact with the plurality of second contact parts to be coupled to a locker holder of the door,
• wherein while the lock releasing guide is not coming into contact with the plurality of first contact parts, the cam is rotated so that the plurality of second contact parts contact with the locker to rotate the locker to be coupled to the locker holder to the door.