Nuclear Fusion describes the state and ultimate goals of nuclear fusion research. The book concentrates on the energy problem in the near future, the role of nuclear fusion reactions for a solution of the energy problem, the requirements for releasing fusion energy and the methods likely to lead to fusion reactions. The book is organised into four sections. In turn these cover the fundamentals of nuclear fusion, methods of magnetic confinement, methods of innertial confinement and the fusion reactor itself. The book has a strong theoretical content, covering those areas of plasma physics which are necessary for an understanding of the confinement problem. This book was first published in Japanese. This edition in English has been thoroughly revised by Keishiro Niu.