text: Osamu Seto† 
  
  Department of Architecture and Building Engineering, 
  
  Hokkai-Gakuen University, Sapporo 062-8605, Japan 
  
  Abstract 
  
  We propose a scenario of the right-handed neutrino dark matter in the context of the minimal 
  
  gauged U (1)B  L model by introducing an additional parity which ensures the stability of dark 
  − 
  
  matter particle. The annihilation of this right-handed neutrino takes place dominantly through the 
  
  s-channel Higgs boson exchange, so that this model can be called Higgs portal dark matter model. 
  
  We show that the thermal relic abundance of the right-handed neutrino dark matter with help of 
  
  Higgs resonance can match the observed dark matter abundance. In addition we estimate the cross 
  
  section with nucleon and show that the next generation direct dark matter search experiments can 
  
  explore this model. 