Exact Event Rates of Lepton Flavor Violating Processes in Supersymmetric $SU(5)$ Model

Event rates of various lepton flavor violating processes in the minimal supersymmetric $SU(5)$ model are calculated, using exact formulas which include Yukawa vertices of lepton-slepton-Higgsino. We find subtlety in evaluating event rates due to partial cancellation between diagrams. This cancellation typically reduces the event rates significantly, and the size of the reduction strongly depends on superparticle mass spectrum.