Organization, research plans and current activities of fusion engineering in Japan are explained. JAERI (Japan Atomic Energy Research Institute) is responsible for ITER technology R&D, R&D for DEMO and power reactor, and basic and baseline researches. In universities and NIFS (National Institute for Fusion Science), fundamental researches for DEMO and commercial reactor, and supporting studies for ITER have been conducted. Recently, Fusion Council of Atomic Energy Commission issued medium-term research plans for first wall structural materials and power generating breeding blanket.