  We investigate a seesaw type mass matrix $M_f\simeq m_L M_F^{-1} m_R$ for
quarks and leptons, $f$, under the assumptions that the matrices $m_L$ and
$m_R$ have common structures for the quarks and leptons, and that the matrix
$M_F$ characterizing the heavy fermion sector has the form [(unit matrix)+
(democratic-type matrix)]. We obtain well-satisfied relations for quark masses
and mixings related to the charged lepton masses.
