  Using the effective potential formalism, we study dynamical chiral symmetry
breaking (D$\chi$SB) in the dual Ginzburg-Landau (DGL) theory, where the color
confinement is brought by monopole condensation. The effective potential as a
function of infrared quark mass is found to have double-well structure, which
leads to spontaneous breaking of chiral symmetry. To examine the role of
confinement, we divide the effective potential into the confinement part and
others, which correspond to the confinement term and other (Yukawa, Coulomb)
terms of the gluon propagator in the DGL theory. It is found that the
confinement part gives the dominating contribution to the \dcsb, which is
regarded as monopole dominance for D$\chi$SB.
