Pb/B $i_2$S $r_2$CaC $u_2$ $O_{8+}$$delta$/-single-crystal junctions with the tunneling direction along the c axis of the crystal were fabricated to obtain an s-wave-superconductor/d-wave-superconductor Josephson junctions. The tunneling R (T) curves and current-voltage characteristics show distinct features which can be explained only under the assumption that the order parameter of high-T $c/Bi_2$$Sr_2$CaC $u_2$ $O_{8+{delta}}$ superconductors has a pure d-wave symmetry, which is in contrast to the case of YB $a_2$$Cu_3$O$7+{delta$}erconductors where a minor s-wave component is also present..