NOVELTY - A granular material is produced by providing a binder coating formed by mixing a spherical raw material powder (b) with organic binder. The granular material is mixed with a raw material powder (a) and spherical raw material powder (b), and molded. A substrate (51) is molded by applying pressure to mixed powder, and baked. A raw material powder (c) is supplied from inner side of the substrate to obtain an intermediate layer (56). A raw material powder (d) is supplied from inner side of the substrate to form an inner side layer (58), and to obtain a silica container (71).    USE - Manufacture of silica container used as crucible for silicon single crystal drawing (all claimed) for solar cell.    ADVANTAGE - The method enables manufacture of silica container having excellent dimensional accuracy, thermal deformation resistance and durability economically, with reduced energy consumption.    DETAILED DESCRIPTION - A raw material powder (a) comprising silica particles as an aggregate, a spherical raw material powder (b) containing amorphous silica and having average particle diameter less than the average particle diameter of raw material powder (a), a raw material powder (c) comprising silica as main component and aluminum element and/or hydroxyl group and/or a compound powder as crystalline-germ material for crystallization of silica glass, and a raw material powder (d) containing crystalline silica and having silica purity more than the raw material powder (a) and spherical raw material powder (b) are prepared. A granular material is produced by providing a binder coating formed by mixing spherical raw material powder (b) with an organic binder and pure water to obtain slurry and drying the slurry. The obtained granular material is mixed with raw material powder (a) and spherical raw material powder (b) to obtain a mixed powder. The mixed powder is molded to predetermined shape with respect to the outer mold by introducing the mixed powder into inner wall of outer mold having rotational symmetry and rotating the outer mold. A substrate is molded by applying pressure to the molded mixed powder between outer and inner molds. The substrate having an opaque silica layer is baked in an oxygen-containing atmosphere, and the strain is removed from the baked substrate by annealing the baked substrate at annealing point to strain point. The raw material powder (c) is dispersed and supplied from the inner side of the substrate by melting using a heat source arranged inside the substrate to obtain an intermediate layer containing silica glass on the inner surface of the substrate. The raw material powder (d) is dispersed and supplied from the inner side of the substrate by melting using heat source arranged inside the substrate to form an inner side layer comprising transparent silica glass on the inner surface of the intermediate layer, and to obtain a silica container.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of the silica container.    Substrate (51)    Intermediate layer (56)    Inner side layer (58)    Silica container (71)