Abstract
Electrical and electrochemical techniques are very useful in the field of biosensing, owing to their simple handling as signal conversion units. It is necessary to develop a recognition unit for identifying a target substance with a high selectivity for the purpose of biosensing. From the viewpoint of molecular recognition, the author has studied the formation of a nanometer-sized space. This paper provides an overview of our research on biosensing using the nanometer-sized space functionally.