IHI grew out of shipbuilding and now works in four business areas. In aero engines, space and defense, it is Japan's leading jet-engine maker and builds rocket turbopumps and defense systems. Its resources, energy and environment business supplies utility boilers, gas turbines and engines, and develops ammonia combustion and carbon capture.
Social infrastructure centers on bridges and tunnels, while industrial systems and general-purpose machinery include turbochargers, from large units to automotive models, with more than 100 million automotive units produced. The group had 26,224 consolidated employees as of March 31, 2026.
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