  We study QED corrections to the chiral symmetry breaking in
Nambu-Jona-Lasinio (NJL) model with two flavors of quarks. In the model the
isospin symmetry is broken by differences of the current quark masses and the
electromagnetic charges between up and down quarks. In the leading order of the
1/N expansion we calculate the effective potential of the model with one-loop
QED corrections. Evaluating the effective potential, we study an influence of
the isospin symmetry breaking on the orientation of chiral symmetry breaking.
The current quark mass has an important contribution for the orientation of
chiral symmetry breaking.
