Whole structure of the flavor-mass mixing in the lepton sector is now known through the measurements of neutrino oscillation. Remaining is the CP phase, which is yet totally unknown. One of the mixing angles, θ23, is close to maximal mixing and its precise measurement is important to understand the origin of the flavor-mass mixing. The recent observation of νe appearance by the accelerator-based long-baseline experiment, T2K, opened a way to access the CP phase and CP violation in the lepton sector. Precise measurement of θ23 and determination of mass ordering are also expected with on-going and future accelerator-based experiment. Current status and prospects of accelerator-based long-baseline neutrino oscillation experiments are reviewed.
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