To provide a door structure of a ceramic art kiln capable of improving workability, by easily closing an opened door, while easily opening the inside of the door, when performing maintenance of a temperature control device and an electric heater installed in the door.

A horizontal door 3 is composed of a first door 3A positioned inside in the thickness direction and a second door 3B positioned outside. The electric heater 6c is installed along an inner wall of the first door, and the temperature control device 4 is installed in the second door. The first door and the second door are rotatably constituted at respective one ends via a support shaft 7, and the respective other ends are mutually detachably constituted via a bolt 53.

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