  We study the gravitational, electromagnetic and scalar field perturbations on
the near-horizon geometries of the even-dimensional extremal Myers-Perry black
holes. By dimensional reduction, the perturbation equations are reduced to
effective equations of motion in AdS$_2$. We find that some modes in the
gravitational perturbations violate the Breitenl\"ohner-Freedman bound in
AdS$_2$. This result suggests that the even-dimensional (near-)extremal
Myers-Perry black holes are unstable against gravitational perturbations. We
also discuss implications of our results to the Kerr-CFT correspondence.
