  We argue that a non-thermal leptogenesis occurs spontaneously, without direct
couplings of the inflaton with right-handed neutrinos, in a wide class of
high-scale inflation models such as the chaotic and hybrid inflation. It is
only a finite vacuum expectation value of the inflaton, or more precisely, a
linear term in the Kahler potential, that is a prerequisite for the spontaneous
non-thermal leptogenesis. To exemplify how it works, we show that a chaotic
inflation model in supergravity naturally produces a right amount of baryon
asymmetry via the spontaneous non-thermal leptogenesis. We also discuss the
gravitino production from the inflaton.
