  The robustness of the chiral surface current of chiral superconductors
against surface roughness is studied utilizing the quasiclassical Eilenberger
theory. We consider the general chiral superconductors where the pair potential
is given by the spherical harmonics $Y_l^m$ such that $(l,m)=(1, \pm1)$ state
corresponds to an ($p_x \pm ip_y$)-wave superconductor. The self-consistent
calculations demonstrate that the robustness of the chiral current is
determined by whether subdominant $s$-wave Cooper pairs are induced by
disorder. The induced $s$-wave pairs act as an effective pair potential. As a
result, the spontaneous chiral current of ($p_x+ip_y$)- and
($d_{x^2-y^2}+id_{xy}$)-wave superconductors are robust against the roughness
because the subdominant $s$-wave Cooper pairs are present.
