To provide a sealing structure of a ceramic tube and a tube plate economically executable with simple constitution while enhancing sealability by pressing a sealing member toward the center of the ceramic tube.

A hole part 3 of the tube plate 2 is provided with a small diameter part 31 through which the ceramic tube 1 is inserted, a large diameter part 32 formed on the cylinder shaft end side rather than the small diameter part 31, and a tapered part 33 formed between the large diameter part 32 and the small diameter part 31. The hole part 3 is also provided with the sealing member 4 formed of a rubber-like elastic body inserting the ceramic tube1 therein and fitted to the large diameter part 32 and tapered part 33 of the tube plate 2, and a tube plate presser member 5 provided with a protrusion 51 compressing the sealing member 4 from the cylinder shaft end side within the hole part 3.

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