My research interests are precise measurement and on-line diagnosis of laser-accelerated ions Beams. In the laser-driven ion acceleration via the interaction of ultrashort, intense laser pulses with matter, known as laser-plasma acceleration, high energy ions are accelerated from mixed radiation field. To characterize the laser-accelerated ion beams (energy distribution, spatial distribution, etc.), I have been applying solid state nuclear track detectors with unique analysis technique. My students and I are going to join the laser-driven ion acceleration experiments at Kansai Photon Science Institute, Japan Atomic Energy Agency.