My major research fields are nuclear physics, hyper and kaonic nuclear physics and physics of the quantum dots. I am applying accurate few-body theoretical method to various systems such as kaonic nuclei and quantum dots. Particularly, we are researching kaonic nuclear physics. The Kaonicnucleus is composed of an anitikaons, neutrons and protons. The research purpose is to understand interaction between kaon and nucleon in unified way by studying the structure of the kaonic nuclei from the viewpoints of three-and four-body problems.