  Leptogenesis in supersymmetric model is discussed comprehensively and in
detail. In the first half, we discuss several leptogenesis mechanisms by the
decay of heavy right-handed neutrino, which include the standard thermal
leptogenesis, leptogenesis via inflaton decay, and leptogenesis from the
coherent oscillation of the right-handed sneutrino. In the second half, we
perform a detailed analysis on the leptogenesis via the LHu flat direction
(Affleck-Dine leptogenesis).
