  In this Letter, we study the latest bound on the mass of doubly charged Higgs
bosons, $H^{\pm\pm}$, assuming that they dominantly decay into a diboson. The
new bound is obtained by comparing the inclusive searches for events with a
same-sign dilepton by the ATLAS Collaboration using the latest 20.3 fb$^{-1}$
data at the LHC 8 TeV run with theoretical prediction based on the Higgs
triplet model with next-to-leading order QCD corrections. We find that the
lower mass bound on $H^{\pm\pm}$ is about 84 GeV.
