  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 $\sin^2
2\theta=1$ with the confidence level of 90%. In addition to these results, a
brief overview of future long-baseline neutrino experiment in Japan, JHF-$\nu$
experiment, is also given in this paper.
