  We study the residues of $\Lambda_Q$-type baryons ($\Lambda_Q$ and $\Xi_Q^A$)
$(Q=b,c)$ and $\Sigma_Q$-type baryons ($\Sigma_Q^{(\ast)}$, $\Xi_Q^{S(\ast)}$
and $\Omega_Q^{(\ast)}$) in the quark-diquark model within the Bethe-Salpeter
(BS) formalism. These residues can be used, for example, in the calculations of
the amplitudes in the scattering processes. After constructing the baryonic
currents in the BS formalism, we derive the relations between the BS wave
functions and the residues for these baryons. The BS equations are solved
numerically with the kernel including the scalar confinement and the one gluon
exchange terms and with the covariant instantaneous approximation being
employed in the calculations. Finally, we obtain the numerical values of the
residues $0.103\,\rm GeV\sim0.224\,\rm GeV$ for $\Lambda_Q$, $0.143\,\rm
GeV\sim0.215\,\rm GeV$ for $\Xi_Q^A$, $0.262\,\rm GeV\sim0.361\,\rm GeV$ for
$\Sigma_Q^{(\ast)}$, $0.313\,\rm GeV\sim0.460\,\rm GeV$ for $\Xi_Q^{S(\ast)}$
and $0.473\,\rm GeV\sim0.571\,\rm GeV$ for $\Omega_Q^{(\ast)}$ in the ranges of
the parameters in our model.
