[en] Fully contained events(F.C.), partially contained events(P.C.) and upward going μ events generated by the interactions for atmospheric neutrinos are measured and analyzed in Super-Kamiokande. The zenith angle distributions of all atmospheric neutrino events strongly suggest the neutrino oscillation. The SK-1 data are consistent with ν_μ -- ν_τ oscillation with Δm²=1.6-3.9x10^-3eV² and sin²2θ ≥ 0.92 at 90% C.L. The Super-Kamiokande oscillation analysis is robust to the uncertainty of the atmospheric neutrino flux calculations and the neutrino interaction cross sections. The zenith angle distributions which are used for ν_μ -- ν_τ oscillation analysis are also consistent with ν_μ -- ν_s oscillation. However, high-energy P.C., upward through going μ events and NC-enrich multi-ring events disfavor ν_μ -- ν_s oscillation hypothesis at 99% C.L. The ν_μ -- ν_s oscillation analysis will be improved by K2K π⁰ study