A door damper. The door damper includes a rotational shaft rotatably coupled to a door, a rotating resistance unit to generate rotating resistance to the rotational shaft, and a latching device latched to the rotational shaft and the door so as to allow the door and the rotational shaft to rotate together in a predetermined region. The latching device includes a free rotating section enabling free rotation of the door at an initial stage of opening the door, and a latching section enabling the latching device to be latched to the rotational shaft and the door at a final stage of opening the door so as to allow the door and the rotational shaft to rotate together. With the door damper, the door of electronic appliances can be smoothly opened without impact, and can be easily closed.