The fusion is studied for reactions between a stable and an unstable nuclei with neutron skin. The reactions and are taken as examples, and the three-dimensional time-dependent Hartree - Fock method with the full Skyrme interaction is used. It is shown that, in such reactions, the nucleon transfer is enhanced enormously for both protons and neutrons. As a whole, it is seen that the neutron skin does not enhance the fusion cross section in the calculations made so far.