  The small quark mixing, described by the Cabibbo-Kobayashi-Maskawa (CKM)
matrix in the Standard Model, may be a clue to reveal new physics around the
TeV scale. We consider a simple scenario that extra particles in a hidden
sector radiatively mediate the flavor violation to the quark sector around the
TeV scale and effectively realize the observed CKM matrix. The lightest
particle in the hidden sector, whose contribution to the CKM matrix is expected
to be dominant, is a good dark matter (DM) candidate, so we focus on the
contribution, and discuss the DM physics. In this scenario, there is an
explicit relation between the CKM matrix and flavor violating couplings, such
as four-quark couplings, because both are radiatively induced by the particles
in the hidden sector. Then, we can explicitly find the DM mass region and the
size of Yukawa couplings between the DM and quarks, based on the study of
flavor physics and DM physics. In conclusion, we show that DM mass in our
scenario is around the TeV scale, and the Yukawa couplings are between ${\cal
O}(0.01)$ and ${\cal O}(1)$. The spin-independent DM scattering cross section
is estimated as ${\cal O}(10^{-9})$ [pb]. An extra colored particle is also
predicted at the ${\cal O}(10)$ TeV scale.
