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The University of Tsukuba's Tandem Accelerator Complex (UTTAC) is a major center of ion beam research in Japan. We planned to install the new horizontal-type 6 MV Pelletron tandem accelerator to replace the damaged 12UD Pelletron tandem accelerator by the Great East Japan Earthquake of 11 March 2011. A three-year plan for the new accelerator's construction was started in 2012. The 6 MV Pelletron tandem accelerator will be used for various ion-beam research projects, such as AMS, microbeam applications, particle-induced X-ray emission (PIXE) analysis for geoscience and materials research, heavy ion RBS and elastic recoil detection analysis, nuclear reaction analysis for hydrogen in materials, and high-energy ion irradiation for semiconductor and nuclear physics. The new accelerator system consists of the 6 MV Pelletron tandem accelerator, four new ion sources, the Lamb-shift polarized ion source, and twelve beam courses. The 6 MV Pelletron tandem accelerator was installed in the spring of 2014 at the University of Tsukuba. Routine beam delivery and experiments will start in 2015., Proceedings of the 13th Heavy Ion Accelerator Technology Conference, HIAT2015, Yokohama, Japan