  The mass splittings of hyperons including the isospin splittings are
calculated with $O(\ms^2)$ and $O(\ms \dm)$ accuracy respectively within the
semibosonized SU(3)-NJL model. The pattern of the isospin splittings is not
spoiled by the terms of the order $O(\ms \dm)$, and both splittings between the
different isospin multiplets and within the same multiplet are well reproduced
for acceptable values of $\ms$ and $\dm$.
