This paper is concerned with sensitivity analysis in parametric vector optimization problems via τ wcontingent derivatives. Firstly, relationships between the τ w-contingent derivative of the Borwein proper perturbation map and the τ w-contingent derivative of feasible map in objective space are considered. Then, the formulas for estimating the τ w-contingent derivative of the Borwein proper perturbation map via the τ w-contingent of the constraint map and the Hadamard derivative of the objective map are obtained.