In this paper we prove microlocal version of the equidistribution theorem for Wigner distributions associated to Eisenstein series on $PS{L}_2\left(\mathbb{Z}\right)\setminus PS{L}_2\left(ℝ\right)$. This generalizes a recent result of W. Luo and P. Sarnak who proves equidistribution for $PS{L}_2\left(\mathbb{Z}\right)\setminus ℍ$. The averaged versions of these results have been proven by Zelditch for an arbitrary finite-volume surface, but our proof depends essentially on the presence of Hecke operators and works only for congruence subgroups of $S{L}_2\left(ℝ\right)$. In the proof the key estimates come from applying...