Mitsubishi Heavy Industries

Mitsubishi Heavy Industries (MHI) is a Japanese industrial conglomerate with a major role in Japan's space launch capability. MHI developed and operated the H-IIA and H-IIB launch vehicles on behalf of JAXA, providing Japan's primary orbital launch service for civil, commercial, and government payloads.^[1][2] H-IIA conducted missions over more than two decades before transitioning to the successor H3 rocket, which MHI leads as developer and operator.^[3][2] The H3 vehicle entered operational service in 2024, succeeding H-IIA as Japan's flagship launch vehicle.^[2][4]