To provide a marine factory reducing energy loss in production/storage/transport so as to improve efficiency of a whole system.

In an all-round factory, a catamaran ship 1 moored on the ocean has: a wind power generation means 2 and an ocean current power generation means 3, or a solar energy collection means 4; a means 5 for desalting sea water; a means 9 for performing electrodialysis of brine water as waste liquid after the desalting; a brine evaporation means 10 condensing the brine water by solar heat, electric heat, or heat generated by molten salt electrolysis; and means 11 for performing molten salt electrolysis of chloride such as natrium and magnesium dissolved in the brine water. Hydrogen chloride is generated by reaction of chlorine generated by molten salt electrolysis and hydrogen generated by electrolysis of fresh water, and the chlorine is generated by reaction of base metal oxide shipped from the land and the hydrogen chloride, and then the hydrogen chloride is subjected to electrolysis so as to efficiently utilize chlorine of waste gas. The electric power generated by fluid energy is utilized for mining manganese crust or sulfide slurry in undersea hydrothermal deposit, and the manganese crust or sulfide is transported to the port.

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