The goal of our research group is to understand fundamental structure and properties of polymer materials and to develop new ones. We deal with versatile polymer materials including rubbers, crystalline and amorphous plastics. Molecular aggregation structure and mechanical, thermal, optical, electrical, and adhesive properties have been investigated combining various mechanical deformation modes and in situ multiscale structure analyses such as small-angle and wide-angle X-ray scattering (SAXS/WAXS) measurements, polarized optical microscopic observation, vibrational spectroscopy. Concrete research topics are (1) network and microphase-separated structure analyses of styrenic triblock thermoplastic elastomer, and polyurethane under uniaxial/biaxial/bulge deformation, (2) change in molecular aggregation structure of polycarbonate, and poly (methyl methacrylate) under uniaxial/biaxial/bulge deformation, (3) analysis of local mechanical property of polymers using synchrotron X-ray beam, and high-speed polarized optical microscopic observation, (4) adhesive and fatigue properties of epoxy, and polyurethanes.