This paper presents the results of oscillation analysis in K2K experiment. The results show indications of neutrino oscillation and give a new constraint on the oscillation parameters. The difference of neutrino masses squared $Delta m^2$ lies between 1.5 and 3.9$times10^{-3} {rm eV}^2$ at $sin^2 2theta=1$ with the confidence level of 90%. In addition to these results, a brief overview of future long-baseline neutrino experiment in Japan, JHF-$ u$ experiment, is also given in this paper.
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