NOVELTY - A raw material powder (b) is mixed with organic binder and pure water and dried. The granular material and raw material powder (a) are mixed to obtain mixed powder (31). The mixed powder is interposed between mold frames, and pressurized to obtain molded substrate (51). The molded substrate is baked in an oxygen-containing atmosphere and subjecting to distortion removal. A heat source provided inside substrate is melted and raw material powder (c) is supplied to inner side of substrate to form a transparent silica glass layer to obtain a silica container.    USE - Manufacture of silica container used as crucible for silicon single crystal drawing (both claimed) for manufacturing solar cell.    ADVANTAGE - The method enables manufacture of silica container having excellent dimensional accuracy and durability, economically.    DETAILED DESCRIPTION - A raw material powder (a) containing silica particles as an aggregate, a raw material powder (b) consists of spherical amorphous silica having average particle diameter less than the average particle diameter of raw material powder (a) and a raw material powder (c) comprising crystalline silica having silica purity more than the raw material powder (a) and raw material powder (b) are prepared. The raw material powder (b) is mixed with an organic binder and pure water to obtain slurry. The slurry is dried to obtain granular material having binder coating. The granular material having binder coating and raw material powder (a) are mixed to obtain mixed powder. The mixed powder is provided to inner wall of an outer mold frame (101) having rotating symmetry and the outer mold frame is rotated to obtain mixed powder in predetermined shape. The mixed powder having predetermined shape is interposed between outer mold frame and an inner mold frame (111), and pressurized to obtain molded substrate. The molded substrate is baked in an oxygen-containing atmosphere at an annealing temperature range from slow cooling point to warped point and subjecting to distortion removal to obtain substrate with opaque silica layer. A heat source provided inside the substrate is melted, and raw material powder (c) is supplied to inner side of substrate to form a transparent silica glass layer on inner surface of the substrate, to obtain a silica container. The baking of substrate and formation of transparent silica glass layer are carried out in random order.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view explaining the manufacture of the silica container.    Mixed powder (31)    Substrate (51)    Outer mold frame (101)    Measurement feeder (105)    Inner mold frame (111)