As a measure for decarbonization in the industrial field in order to achieve carbon neutrality, the use of hydrogen is under consideration. One challenge is to provide a large and stable supply of hydrogen, and expectations for highly efficient hydrogen production using CO2-free high-temperature heat from High-Temperature Gas-cooled Reactors (HTGR) are growing. Mitsubishi Heavy Industries, Ltd. is promoting the development of a demonstration HTGR for hydrogen production as a core company, and at the same time, is working on verification of connection technology with hydrogen production facilities, development of CO2-free hydrogen production technology, and development of evaluation technology for design of HTGR. Through these efforts, we aim to realize a HTGR for hydrogen production and contribute to the realization of a carbon-neutral society.