  We propose simple phenomenological lepton mass matrices which describe the
three neutrinos almost degenerate in mass, leading to a very large mixing angle
between $\nu_\mu$ and $\nu_\tau$, as consistent with a recent report on
atmospheric neutrino oscillation from the Superkamiokande collaboration. Our
matrix model also gives $\nu_e-\nu_\mu$ mixing in agreement with the value
required for neutrino oscillation to explain the solar neutrino problem.
