  We propose an attractive model that excess of electron recoil events around
1-5 keV reported by the XENON1T collaboration nicely links to the tiny neutrino
masses based on a radiative seesaw scenario. Our dark matter(DM) is an isospin
singlet inert boson that plays an role in generating non-vanishing neutrino
mass at one-loop level, and this DM inelastically interacts with a pair of
electrons at one-loop level that is required to explain the XENON1T anomaly. It
is also demanded that the mass difference between an excited DM and DM has to
be of the order keV. Interestingly, the small mass difference $\sim$keV is
proportional to the neutrino masses. It suggests that we have double
suppressions through the tiny mass difference and the one-loop effect. Then, we
show some benchmark points to explain the XENON1T anomaly, satisfying all the
constraints such as the event ratio of electrons of XENON1T, a long lived
particle be longer than the age of Universe, and relic density in addition to
the neutrino oscillation data and lepton flavor violations(LFVs).
