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We propose a scenario of dark sector described by a hidden $SU(2)$ gaugesymmetry which is broken by a vacuum expectation value(VEV) of a scalarmultiplet. We discuss a general mass relation among $SU(2)$ gauge bosons afterspontaneous symmetry breaking which is determined by weight of gauge grouprepresentation associated with a scalar multiplet developing VEV. Then a modelwith quintet and triplet scalar fields is discussed in which hidden gauge bosoncan be dark matter(DM) stabilized by remnant discrete $Z_2$ symmetry andresonant dark matter annihilation is realized by mass relation between DM andmediator. We estimate relic density and spin independent DM-nucleon scatteringcross section searching for allowed parameter region.

Vector dark matter from a gauged $SU(2)$ symmetry