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We construct the minimal dark matter models in the left-right symmetricextensions of the standard model (SM), where the gauge symmetrySU(3)$_C\times$SU(2)$_L\times$SU(2)$_R\times$U(1)$_{B-L}$ is broken into itssubgroup 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 ofdark matter is explored in the framework of minimal dark matter consideringSU(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 mattercandidates and investigate phenomenology of them. We show that the dark matterin the model can provide observed relic density with 2 TeV $W'$ boson which ismotivated by the ATLAS diboson excess and CMS $eejj$ excess. The possible massof dark matter is predicted for each $B-L$ charge. We then estimate thescattering cross section of dark matter with nucleon and production crosssection of charged components in the quintuplets at the LHC.

SU(2)$_L\times$SU(2)$_R$ minimal dark matter with 2 TeV $W'$