We are studying on physical chemistry of molecular adsorption. The keywords of our research are “adsorption” and “nanometer-sized spaces”. We aim to clarify the behavior of molecules trapped in “nanometer-sized spaces” from the microscopic viewpoints. We are investigating the physical properties and reactions of molecular assembly confined in such nanometer-sized spaces using the state-of-the-art experimental techniques mainly focusing on nuclear magnetic resonance (NMR) spectroscopy. In addition, we are also exploring new molecular assemblies constructed in the nanometer-sized spaces with a regular structure, using “adsorption phenomena”.