JOINED CERAMIC ARTICLE, SUBSTRATE HOLDING STRUCTURE AND APPARATUS FOR TREATING SUBSTRATE

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A substrate holding structure having excellent corrosion resistance and airtightness, having excellent dimensional accuracy and having sufficient durability when mechanical or thermal stress is applied thereto is obtained. A holder (1) serving as the substrate holding structure according to the present invention comprises a ceramic base (2) for holding a substrate, a protective cylinder (7) joined to the ceramic base (2) and a joining layer (8) positioned between the ceramic base (2) and the protective cylinder (7) for joining the ceramic base (2) and the protective cylinder (7) to each other. The joining layer (8) contains at least 2 mass % and not more than 70 mass % of a rare earth oxide, at least 10 mass % and not more than 78 mass % of aluminum oxide, and at least 2 mass % and not more than 50 mass % of aluminum nitride. The rare earth oxide or the aluminum oxide has the largest ratio among the aforementioned three types of components in the joining layer (8).