  It is shown that the metal abundance in the solar interior is constrained
from the current solar neutrino experiment, even if one allows neutrino
conversion in the sun due to neutrino oscillation. The result shows that the
metal abundance in the interior should be within the range 0.4 - 1.4 times that
in the surface, supporting the idea that the sun formed by a contraction of a
gas cloud with an almost homogeneous composition.
