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The T2K project, the next-generation long base-line neutrino oscillation experiment to explore neutrino mass and mixing (further CPV), is one of the main motivations to construct J-PARC, The Japan Proton Accelerator Research Complex at Tokai. It will employ the 50 GeV proton synchrotron to produce neutrino super-beam, and a 50 kt water Cherenkov neutrino detector at Kamioka mine, Super-Kamiokande, as a far neutrino detector. The baseline length of 295 km. The neutrino beam-line is in the midst of its apparatus production and civil construction, towards the beam commissionning scheduled in April 2009. One of the main features of the beam-line is that the axis of the beam optics is displaced by a few degrees from the far detector direction to produce a narrower and lower neutrino energy spectrum than that of conventional on-axis beam. Our beam-line design makes it possible to adjust the off-axis angle, i.e. neutrino beam energy, to maximize neutrino oscillation effect. In this talk I will also briefly introduce other econdary beam-lines at J-PARC, the hadron beam lines and neutron and muon beam lines.
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