To provide a ceramic structure having excellent joining strength.

The ceramic structure 1 is formed by joining ceramic members comprising the same material to each other through a joining material made substantially from a the same material as the ceramic member to make a hollow box type structure. The joining material has 0.05-0.5 mm thickness in the vertical direction to a joining surface and is formed to be projected in a zone ≥70% of the joining surface facing a hollow part in the width direction parallel to the joining surface and to cover a side wall adjacent to the joining surface. The ratio (w/t) of the projected distance (w) of the joining material from the joining surface to the thickness (t) is 2-10 and the ratio (δ/t) of the coating distance (δ) of the joining material from the joining surface to the the thickness (t) is 0.5-5.