  We propose a model with an $U(1)_{B-L}$ gauge symmetry, in which small
neutrino masses, dark matter and the matter-antimatter asymmetry in the
Universe can be simultaneously explained. In particular, the neutrino masses
are generated radiatively, while the matter-antimatter asymmetry is led by the
leptogenesis mechanism, at TeV scale. We also explore allowed regions of the
model parameters and discuss some phenomenological effects including lepton
flavor violating processes.
