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                - N. Sakamoto, H. Imao, O. Kamigaito, K. Kusaka, H. Okuno, K. Ozeki, K. Suda, T. Watanabe, Y. Watanabe, K. Yamada
 
                       RIKEN Nishina Center, Wako, Japan 
                - H. Hara, T. Yanagisawa
 
                       MHI, Hiroshima, Japan 
                - E. Kako, H. Nakai, H. Sakai, K. Umemori
 
                       KEK, Ibaraki, Japan 
                - A. Miyamoto, K. Sennyu
 
                       MHI-MS, Kobe, Japan 
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        An upgrade project of the RIKEN Heavy-Ion Linac, RILAC, is under going, which aims at the further investigation of the super-heavy elements and production of radioactive isotopes for medical applications. In this project, a new superconducting ECR ion source and superconducting RF (SRF) booster linac are being developed and constructed. The SRF linac consists of 10 quarter-wavelength resonator operated at 73 MHz, that are contained in three cryomodules. The construction status, including the first vertical test results, will be given in this paper.
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