  The Skyrme model is reconsidered from an effective theory point of view. From
the most general chiral Lagrangian up to including terms of order $p^4$, $N_c$
and $\delta m^2$ ($\delta m\equiv m_s-m$), new interactions, which have never
been considered before, appear upon collective coordinate quantization. We
obtain the parameter set best fitted to the observed low-lying baryon masses,
by performing the second order perturbative calculations with respect to
$\delta m$. We calculate the masses and the decay widths of the other members
of (mainly) anti-decuplet pentaquark states. The formula for the decay widths
is reconsidered and its baryon mass dependence is clarified.
