  We discuss spontaneous chiral symmetry breaking and quark bilinear condensate
in large $N_c$ QCD. It has been known that the existence of $\eta'$ meson is
implied in large $N_c$ QCD as pointed out by Witten and Veneziano. First, we
show that the existence of $\eta'$ and Ward-Takahashi identities imply the
existence of the Nambu-Goldstone bosons from chiral symmetry breaking
$SU(N_f)_L \times SU(N_f)_R \to SU(N_f)_V$. Second, we show that a QCD
inequality implies a nonzero lower bound on the quark bilinear condensate.
