  WIMP dark matter and gauge coupling unification are considered in an R-parity
violating MSSM with vector-like matter. Dark matter is contained in an
additional vector-like SU(2)$_L$ doublet which possesses a new U(1) gauge
symmetry. The Higgs fields are extended to be in a ${\bf 5\oplus \bar{5}}$
representation of SU(5). The stability of dark matter is a result of gauge
symmetries, and the mass of the dark matter particle is between (1.1-1.5) TeV.
Dark matter has a very small cross section with nucleis, thus the model is
consistent with current dark matter direct detection experiments such as
Xenon100. The model also predicts new charged and colored particles to be
observed at LHC.
