We revisit the discrete dark matter model with $A_4$ flavor symmetry<br />
originally introduced by M.Hirsch {\it et.al}. We show that radiative<br />
corrections can lead to non-zero $\theta_{13}$ and non-zero mass for the<br />
lightest neutrino. We find an interesting relation among neutrino mixing<br />
parameters and it indicates the sizable deviation of $s_{23}$ from the maximal<br />
angle $s_{23}^2=1/2$ and the degenerate mass spectrum for neutrinos. Also we<br />
study the possibilities that the right-handed neutrino is a dark matter<br />
candidate. Assuming the thermal freeze-out explains observed dark matter<br />
abundance, TeV-scale right-handed neutrino and flavored scalar bosons are<br />
required. In such a case, flavor symmetry plays an important role for the<br />
suppression of lepton flavor violating processes as well as for the stability<br />
of dark matter. We show that this scenario can be viable against currently<br />
existing constraints from collider, low energy experiments and cosmological<br />
observations.