  Quark-hadron duality in neutrino-nucleon reactions is investigated under the
assumption that cross sections in the resonance region are given by the
Rein-Sehgal model. The quantitative analysis of the duality is done by means of
appropriate integrals of the structure functions in the Nachtmann variable. We
conclude that with the definition of the resonance region $W\in (M+m_{\pi}, 2$
GeV) the duality holds for neutrino-proton reaction $F_2$ structure function
for $Q^2\in (0.5, 3)$ GeV$^2$ and it is absent for neutrino-neutron reaction.
