A search for the doubly charged Higgs boson, a member of $SU(2)_L$ scalar triplet $\Phi$ participating in the seesaw mechanism of type II, in $pp$ collisions at $\sqrt{s}=7$~TeV is presented. The data correspond to an integrated luminosity of 36 $\text{pb}^{-1}$ collected by the CMS experiment at the LHC. The inclusive search is performed in events with three and four isolated charged leptons of all flavours originating from the decays of pair produced triplet components $\Phi^{++}\Phi^{--}$ and $\Phi^{++}\Phi^{-}.$ With the present collected luminosity the CMS experiment is sensitive to the $\Phi$ mass range in which the possible decays $\Phi^{++}\to W^{+}W^{+}$ are forbidden kinematically. No signal excess is observed and lower limits at the 95\% confidence level are set on the $\Phi^{++}$ mass of 156\GeV in the $\mu\mu$ channel, 154\GeV in e$\mu$ channel, of 144\GeV in $ee$ channel and between 116\GeV and 131\GeV in the four defined benchmark points.

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