UVSOR has been operational for 27 years, providing synchrotron light in the wavelength range from the terahertz waves to soft X-rays. The accelerators have been continuously upgraded, especially in 2000’s. The lattice of the storage ring was modified to achieve smaller emittance and to create new straight sections for undulators. At present, the ring is operated with small emittance, 27 nm-rad. Totally four undulators are in operation and two more can be installed. The injector and the beam transport line were upgraded to be compatible with full energy injection. The radiation shielding was reinforced. In 2010, top-up operation was fully introduced to users operation. A new straight section was created by moving the injection point, which will be used for developments of new light source technologies.
