Atmospheric and Long Baseline Neutrino

This paper presents the recent results from Super-Kamiokande atmospheric neutrinos and from K2K accelerator neutrinos. Both results show the signal of neutrino oscillation, and provide new and precise information of oscillation parameters. The oscillation parameters are constraint to be between 1.5*10^{-3} eV^2 and 3.9*10^{-3} eV^2 for \Delta m^2 and to be greater than 0.92 for sin^2 2\theta.