Japan Aerospace Exploration Agency

JAXA receives almost all its funding from the Japanese government through the Ministry of Education, Culture, Sports, Science and Technology. Its annual budget was approximately ¥219 billion for fiscal year 2024, allocated by the Diet as part of the national budget process. The agency also administers the Space Strategy Fund on behalf of the Cabinet Office, directing grants to universities and private-sector R&D projects.

JAXA is a space program operator and R&D agency, not a regulator. It builds rockets, satellites, and spacecraft, manages Japan's astronaut corps, and funds space-science grants. Regulatory functions for launch licensing and spectrum allocation sit with the Cabinet Office's National Space Policy Secretariat and the Ministry of Internal Affairs and Communications, not with JAXA.

JAXA is a formal NASA partner on the Artemis lunar exploration program. In May 2024, the agencies signed an agreement under which JAXA will provide a crewed pressurized rover that astronauts will use on the lunar surface, manufactured in collaboration with Toyota. Japan also contributes batteries and environmental-control systems to the Gateway lunar space station and receives astronaut flight opportunities in return.

JAXA operates the H-IIA and the new H3 rocket from the Tanegashima Space Center in Kagoshima Prefecture. The H3, first successfully launched in February 2024, is designed to be a lower-cost, higher-flight-rate successor to the H-IIA. The agency also operates the smaller Epsilon solid-fuel rocket from the Uchinoura Space Center, primarily for scientific satellite missions.

JAXA transfers technology and provides testing infrastructure to firms like ispace, Astroscale, and Synspective while purchasing launch services from Mitsubishi Heavy Industries. The agency's industrial partnership model uses private contractors for rocket manufacturing and satellite integration, with JAXA acting as the mission architect and operator — a structure that builds domestic aerospace supply chains rather than competing with them.

Hayabusa2 returned samples from asteroid Ryugu in December 2020 and is now an extended mission targeting asteroid 1998 KY26. The Martian Moons eXploration mission, scheduled to launch in 2026, aims to land on Phobos and return surface samples to Earth. JAXA also operates the Akatsuki Venus orbiter and contributes instruments to ESA's BepiColombo Mercury mission and JUICE Jupiter mission.

JAXA's founding law restricts it to peaceful purposes only. However, Japan's 2008 Basic Space Law opened the door for defense-related space use, and JAXA satellites carrying dual-use sensors now provide data to the Ministry of Defense. The agency itself remains a civilian organization under MEXT, while military space procurement runs through the Ministry of Defense's separate budget lines.