  We give a concise formula for the non-Gaussianity of the primordial curvature
perturbation generated on super-horizon scales in multi-scalar inflation model
without assuming slow-roll conditions. This is an extension of our previous
work. Using this formula, we study the generation of non-Gaussianity for the
double inflation models in which the slow-roll conditions are temporarily
violated after horizon exit, and we show that the non-linear parameter $f_{NL}$
for such models is suppressed by the slow-roll parameters evaluated at the time
of horizon exit.
