  We propose and study a common hierarchical mass texture for both charged
lepton and neutrino sectors. The texture gives rise to a large
$\nu_\mu\leftrightarrow\nu_\tau$ mixing. Also it leads to the small angle MSW
effect solution for solar neutrino data. It naturally gives a small
$\nu_e\leftrightarrow \nu_\tau$ oscillation relevant to the CHOOZ result in
certain mass limits.
