In this article, the sequence spaces f 0 (N t ) and f (N t ) are introduced as the domain of Nörlund mean in the spaces f 0 and f of almost null and almost convergent sequences which are isomorphic to the spaces f 0 and f , respectively, and some inclusion relations are given. Additionally, alpha, beta and gamma duals of the sequence spaces f 0 (N t ) and f (N t ) are determined. Finally, the classes (λ(N t ) : µ) and (µ : λ(N t )) of matrix transformations are characterized for given sequence spaces λ and µ together with two Steinhaus type results.