  We study prolongation of Norden structures on manifolds to their generalized
tangent bundles and to their cotangent bundles. In particular, by using methods
of generalized geometry, we prove that the cotangent bundle of a complex Norden
manifold $(M,J,g)$ admits a structure of Norden manifold, $(T^{\star}(M),\tilde
J, \tilde g)$. Moreover if $(M,J,g)$ has flat natural canonical connection then
$\tilde J$ is integrable, that is $(T^{\star}(M),\tilde J, \tilde g)$ is a
complex Norden manifold. Finally we prove that if $(M,J,g)$ is K\"ahler Norden
flat then $(T^{\star}(M),\tilde J, \tilde g)$ is K\"ahler Norden flat.
