We prove that a conformal transformation φ : (M, g^*)→(M, g) with Ric_g^*=Ric_g preserves Riemannian curvature tensors. Moreover, in a fibred Riemannian space, if any horizontal mapping covering is a Ricciinvariant conformal transformation and the total space is Einstein, then each fibre is a totally geodesic submanifold of the total space.