Japan Aerospace Exploration Agency (JAXA) has been established in Oct. 1, 2003, after the merger of three Japanese space organizations, i.e. National Space Development Agency of Japan (NASDA) , National Aerospace Laboratory of Japan (NAL) and Institute of Space and Aeronautical Science (ISAS). Discussion and coordination on how to build the new space organization in both governmental side and former three organizations' side were initiated by the decision of the Minister of Education, Culture, Sports, Science and Technology (MEXT) in Aug. 2001. Here are summarized the chronicle of the consolidation processes and the structures of newJapanese space organization, JAXA. The structures within JAXA for the promotion of science in space environmental utilization are also outlined.