  We investigate the \eta'N two-body interaction in the context of the \eta'
meson mass modification in the nuclear medium. It has been argued in several
articles that the masses of \eta' and the other pseudoscalar mesons (\pi, K,
\eta) should degenerate in the chiral-symmetric phase. It is expected that the
reduction of the mass difference between eta and eta' would take place in the
nuclear matter if one assumes that the decrease of the quark condensate at the
normal nuclear density occurs with partial restoration of chiral symmetry. At
low density, the in-medium self-energy giving the mass modification by the
medium effect can be obtained by the \eta'N two-body T matrix. Thus, we also
estimate the \eta'N interaction strength in vacuum with the linear sigma model
which involves the effect of partial restoration of chiral symmetry. In the
view of the linear sigma model, we find that the \eta'N interaction is
attractive and generated through the sigma meson exchange.We expect that the
interaction is enough strong and for the existence of a bound state of the
\eta'N system.
