text: is imposed on the minimal U(1)B  L model, the symmetry breaking scale appears to be the 
  − 
  
  TeV scale naturally. If this is the case, all new particles, the Z ′ gauge boson, the B  L 
  
  − 
  L gauge  Higgs boson H and the RH neutrinos appear at the TeV scale unless the U(1)B 
  − 
  
  coupling is extremely small, and they can be discovered at Large Hadron Collider [5–8]. 
  
  Then we may be able to understand the relation between the gauge symmetry breaking and 
  
  the origin of neutrino masses. 
  
  Although such a TeV scale model is interesting and appealing, one might think that the 
  
  absence of dark matter (DM) candidate is a shortcoming of this model. A sterile RH neutrino 
  
  with mass of the order of MeV is one possibility [9]. In this paper, we propose a very simple 
  
  idea to introduce the DM candidate in the minimal gauged U(1)B  L model. We introduce 
  − 
  
  the Z2 parity into the model and impose one of three RH neutrinos to be odd, while the 
  
  others even. In this way, the Z2-odd RH neutrino becomes stable and the DM candidate. 