  The magnetic properties and Mott transition of the half-filled Hubbard model
on the 1/5 depleted square lattice with frustration is studied at zero
temperature by the variational cluster approximation. The $(\pi,\pi)$ N\'eel
ordering (AF) is stable in a wide region of the phase diagram and almost
completely veils the non-magnetic Mott transition for the unfrustrated case.
However, AF is severely suppressed by the frustration and even with moderate
frustrations the non-magnetic Mott transition takes place in the range where
the intra-dimer hoppings are larger than the intra-plaquette hoppings.
