Higgs Branch of N=2 SQCD and M theory Branes

Higgs branch of N=2 SQCD is studied from the M theory viewpoint. With a differential geometrical proof of the s-rule besides an investigation on the global symmetry of M theory brane configurations, an exact description of the baryonic and non-baryonic branches in terms of M theory is presented. The baryonic branch root is also studied. The ``electric'' and ``magnetic'' descriptions of the root are shown to be related with each other by the brane exchange in M theory.