  We review the relativistic mean-field approach to various aspects of
hypernuclei. It was Brockmann and Weise who first applied this approach to
hypernuclei. At that time, it had been already observed experimentally that the
spin-orbit splittings in hypernuclei are significantly smaller than that in
ordinary nuclei. The relativistic approach was suitable for a discussion of
spin-orbit splittings in hypernuclei, as the spin-orbit interaction is
naturally emerged with the relativistic framework. Since this seminal work,
many developments have been done and the relativistic approach has been applied
both to the ground state and to excited states of hypernuclei. We summarize
those developments in the Chapter. We shall concentrate on
$\Lambda$-hypernuclei and do not discuss $\Sigma$ hypernuclei, since the
theoretical treatment is rather similar to each other.
