Door apparatus of heating furnace

The present invention relates to a door apparatus of a heating furnace, including: an open portion formed on the sides of the heating furnace; a door installment room funneled to the inside of the heating furnace to the outside of the open portion, and has an open hole portion on the bottom; a door for opening and closing the open hole portion; a skid beam installed inside the heating furnace to support a material; and a transfer beam for transferring the material supported by the skid beam to the outside through the open portion and open hole portion.