  We consider inelastic dark matter scenarios with dark photon mediator and a
dark Higgs boson. The dark Higgs boson spontaneously breaks the gauge symmetry
associated with the dark photon, and gives the mass to the dark photon and the
mass difference to dark particles. Such a dark Higgs boson can decay into the
dark particles and hence can be another source of the dark particles at
collider experiments. We analyze the sensitivity to decays of the excited state
into the dark matter and charged particles at the FASER 2 experiment in fermion
and scalar inelastic dark matter scenarios. We consider two mass spectra as
illustrating examples in which the excited state can be produced only through
the decay of dark Higgs boson. We show that unprobed parameter region can be
explored in fermion dark matter scenario for the illustrating mass spectra.
