  We construct the minimal dark matter models in the left-right symmetric
extensions of the standard model (SM), where the gauge symmetry
SU(3)$_C\times$SU(2)$_L\times$SU(2)$_R\times$U(1)$_{B-L}$ is broken into its
subgroup SU(3)$_C\times$U(1)$_{\rm em}$ by nonzero VEVs of a SU(2)$_R$ doublet
$H_R$ and a SU(2)$_L\times$ SU(2)$_R$ bidoublet $H$. A possible candidate of
dark matter is explored in the framework of minimal dark matter considering
SU(2)$_{L, R}$ multiplet scalar bosons and fermions. Then we focus on SU(2)$_R$
quintuplet fermions with $B-L$ charges 0, 2 and 4 as the minimal dark matter
candidates and investigate phenomenology of them. We show that the dark matter
in the model can provide observed relic density with 2 TeV $W'$ boson which is
motivated by the ATLAS diboson excess and CMS $eejj$ excess. The possible mass
of dark matter is predicted for each $B-L$ charge. We then estimate the
scattering cross section of dark matter with nucleon and production cross
section of charged components in the quintuplets at the LHC.
