The Regge Teitelboim model is considered in the minisuperspace version to find out its gauge symmetries. Exploiting the first order formalism dveloped by Banerjee et. al. the diffeomorphism symmetry is extracted. From the general form of the gauge transformations of the field the BRST transformations are calculated. The effective Lagrangian is constructed by considering two gauge fixing conditions. Further, the BRST (conserved) charge is computed which plays an important role in defining the physical states from the total Hilbert space of states. The finite field dependent BRST (FFBRST) formulation is also studied in this context where the Jacobian for functional measure is illustrated specifically.