I have been working on X-ray observation of supernova remnants and development of X-ray CMOS sensors. For the former, my interest is in thermal plasma of supernova remnants, especially in recombining plasma which is caused by interaction between hot plasma and cool molecular clouds. For the latter, I have developed event-driven pixel detectors for future X-ray astronomy satellites on the basis of silicon-on-insulator technology. I will take on observational and experimental study with radio or gamma-ray without limiting used band to X-rays.