To provide a large flat bottom cylindrical cryogenic tank suitable for storing liquefied hydrogen having a vacuum layer with a required degree of vacuum and a high heat-insulating and high-strength cold-insulating structure between an inner tank and an outer tank provided around the outer side of the inner tank and a method for manufacturing the same. The large flat-bottomed cylindrical cryogenic tank of the present invention is characterized in that it comprises a vacuum layer in which a substance present in a space between an inner tank and an outer tank maintains an equilibrium state of a solid and a gas, and is supported by a honeycomb-like heat-insulating structure supporting the inner tank at the bottom between the inner tank and the outer tank of the large flat-bottomed cylindrical cryogenic tank of the present invention. Also, the manufacturing method of the large-sized flat-bottomed cylindrical cryogenic tank of the present invention...

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