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The quarter-filling extended Hubbard model on the triangular lattice isstudied to explore pairing instability in the three-fold charge-ordered (CO)metal. We derive a second-order strong-coupling effective Hamiltonian of dopedcarriers into the three-fold CO insulator at electron density of $n=2/3$, andthen study the $f$- and $d_{xy}$-wave superconductivities down to $n=1/2$ byusing the BCS mean-field approximation. It is found that the triplet $f$-wavepairing is more stable than the $d_{xy}$-wave one. We also point out that thiscoexisting state of the charge ordering and superconductivity is possible tohave critical temperature $T_c \sim 0.01 t$.

Superconductivity in the Three-Fold Charge-Ordered Metal of the Triangular-Lattice Extended Hubbard Model