PURPOSE: To provide a kiln for ceramics in which raw ceramic material can be forwarded at a rate alterable as desired, the condition set for each heating zone can be maintained, and moreover the temporary firing and the main firing of raw ceramic material can be carried out in a continuous process.

CONSTITUTION: A kiln for ceramics 1 has a furnace body 3 having heating zones 2 into which the furnace is longitudinally divided, a plurality of tubular furnace cores 4 each of which is longer than the respective heating zone 2 and differs in inner diameter (d) from the others, and endless drives 5 in a plurality of sets which support the tubular furnace cores 4, each set holding one tubular furnace core at its two ends with its circumferential side on themselves in a manner of suspension and designed to revolve independent of the other sets. The tubular furnace cores 4 are so arranged that from the loading end 3a of the furnace body 3 they become enlarged in inner diameter (d) toward the discharging end 3b, that is, a succession of an arrangement that the end 4b on the discharging side of a tubular furnace core 4 having a smaller inner diameter (d) is inserted in the end 4a on the loading side of a tubular furnace core 4 having a larger inner diameter (d). Furthermore, a gas-discharging pipe 12 is provided between each two heating zones 2 where the differing inner diameters (d) between two adjoining tubular furnace cores 4 form a gap 10.