  We study the effect of QCD-monopole condensation on the dynamical
chiral-symmetry breaking by using the dual Ginzburg-Landau theory of QCD. We
formulate the Schwinger-Dyson equation and solve it numerically. The large
enhancement is found for the chiral-symmetry breaking due to QCD-monopole
condensation, which suggests the close relation between the color confinement
and the chiral-symmetry breaking.
