[en] The RIKEN Accelerator Research Facility (RARF) has been further upgraded since 1991, according to the short- and middle-term improvement programs. Beam currents of 135 MeV/nucleon light ions routinely exceed 200 pnA; the maximum record has reached 500 pnA. A polarized deuteron beam of 270 MeV has been successfully obtained. Beam currents of RILAC-injected heavy ions have been improved by a factor of 2-3, by newly installing a second-harmonic buncher on the injection beam line of the RILAC. The current status of the improvement programs including these achievements are given. A future plan of the facility presently under discussion is also briefly presented. (author)