We consider the possibility that the massive graviton is a viable candidate of dark matter in the context of bimetric gravity .
We first derive the energy-momentum tensor of the massive graviton and show that it indeed behaves as that of dark matter fluid .
We then discuss a production mechanism and the present abundance of massive gravitons as dark matter .
Since the metric to which ordinary matter fields couple is a linear combination of the two mass eigenstates of bigravity , production of massive gravitons , i.e .
the dark matter particles , is inevitably accompanied by generation of massless gravitons , i.e .
the gravitational waves .
Therefore , in this scenario some information about dark matter in our universe is encoded in gravitational waves .
For instance , if LIGO detects gravitational waves generated by the preheating after inflation then the massive graviton with the mass of \sim 0.01 GeV is a candidate of the dark matter .