Liquefied hydrogen production device

A liquid hydrogen production device comprising:

• a carbon dioxide cycle plant, which includes a turbine using a carbon dioxide fluid as a driving fluid, and is configured to drive the turbine to generate motive power with use of a carbon dioxide cycle in which the carbon dioxide fluid discharged from the turbine is increased in pressure and heated and is then re-supplied to the turbine;
• and
• a liquefaction plant configured to cool gaseous hydrogen by heat exchange with a refrigerant, to obtain liquid hydrogen, wherein the liquefaction plant comprises a refrigeration cycle including a refrigerant compressor configured to compress the refrigerant for cooling and liquefying the hydrogen, and the refrigerant compressor is connected to the turbine of the carbon dioxide cycle plant and is configured to be driven through mechanical transmission of the motive power generated in the turbine.