Abstract This paper involves three real approaches to constitute functional molecular materials toward molecular devices: (1) Method to materialize various functional molecules with conducting polymer matrix which conveys and reflects electronic structure and states of these molecules: The resulting functional molecule incorporating conducting polymer materials showed characteristic functionalities caused by those incorporated molecules. (2) Ultramicro-fabrications of conducting polymers, by LB method, by electrochemical copolymerization method, and photochemical polymerization method: They provided us an ultra-high anisotropic conducting and insulating alternative multi-layers, a nm level depth profile controlled conducting copolymer multi-layers, and 2D, 3D conducting polymer network fabrication. (3) Multifunctionalization of functional molecule to be incorporated in molecular materials: A few multi-mode chemical signal transducer molecule which can respond to multi-mode stimulations were designed and demonstrated.