NOVELTY - The thermochemical hydrogen production apparatus has Bunsen reactor (1), phase separation device (2), electrodialyzer (3), hydrogen iodide fractionating column (4) and hydrogen iodide thermal decomposition separation portion (5). Reactor performs reaction of water, sulfur dioxide and iodine, and produces sulfuric acid and hydrogen iodide. Device (2) separates hydrogen iodide, sulfuric acid and iodine. Electrodialyzer converts iodine into hydrogen iodide, and produces hydrogen iodide aqueous solution. Portion (5) thermally decomposes hydrogen iodide and produces hydrogen.    USE - For thermochemically producing hydrogen.    ADVANTAGE - The hydrogen production apparatus efficiently enables generation of hydrogen.    DETAILED DESCRIPTION - The thermochemical hydrogen production apparatus has a Bunsen reactor (1), a phase separation device (2), an electrodialyzer (3), a hydrogen iodide fractionating column (4) and a hydrogen iodide thermal decomposition separation portion (5). The Bunsen reactor carries out reaction of water, sulfur dioxide and iodine, and produces sulfuric acid and hydrogen iodide. The phase separation device separates aqueous solution containing hydrogen iodide, aqueous solution containing sulfuric acid, and iodine. Aqueous solution containing hydrogen iodide and iodine are supplied to electrodialyzer, and electrodialyzer converts iodine into hydrogen iodide and produces hydrogen iodide aqueous solution. The fractionating column produces and purifies hydrogen iodide obtained using hydrogen iodide aqueous solution. The thermal decomposition separation portion thermally decomposes hydrogen iodide, and produces and separates hydrogen. An INDEPENDENT CLAIM is included for operating method of thermochemical hydrogen production apparatus.    DESCRIPTION OF DRAWING(S) - The figure shows the block diagram of structure of thermochemical hydrogen production apparatus. (Drawing includes non-English language text)    Bunsen reactor (1)    Phase separation device (2)    Electrodialyzer (3)    Hydrogen iodide fractionating column (4)    Hydrogen iodide thermal decomposition portion (5)