Ceramic sintered body manufacturing method

In the present invention manufacturing method of a ceramic sintered body, which involves a step for degreasing green sheet laminate bodies obtained by laminating multiple green sheets that contain a ceramic powder, a sintering aid and a binder resin, a structure is prepared that comprises multiple green sheet laminate bodies provided in the thickness direction of the sheets, and partition members provided on both sides of the individual green sheet laminate bodies, wherein a space allowing passage of a decomposition gas generated with decomposition of the binder resin is provided between two partition members disposed between green sheet laminate bodies; the aforementioned degreasing step is carried out by heating the aforementioned structure. The present invention enables providing a manufacturing method of a ceramic sintered body which has excellent production efficiency, and which, during degreasing, can suppress warping and cracking of green sheets and residues from degreasing.