  We propose a scenario for the generation of baryon number asymmetry based on
the inflaton decay in a radiative neutrino mass model extended with singlet
scalars. In this scenario, lepton number asymmetry is produced through the
decay of non-thermal right-handed neutrinos caused from the inflaton decay.
Since the amount of non-thermal right-handed neutrinos could be much larger
than the thermal ones, the scenario could work without any resonance effect for
rather low reheating temperature. Sufficient baryon number asymmetry can be
generated for much lighter right-handed neutrinos compared with the
Davidson-Ibarra bound.
