A tannin gel (TG) synthesized from condensed tannin molecules has a remarkable ability to adsorb various metal ions in aqueous solutions. In the present study, we have introduced thiocyanate ions (SCN-) into the TG by adsorption process in acidic thiocyanate solutions to improve its adsorbability for palladium ion, Pd(II). TO determine the optimum conditions for preparing the SCNT- retaining tannin gel (SCN-TG), we have investigated the introduction mechanism of SCN- into the TG at 298 K and HCl concentrations legs than or equal to 1 M, where the decomposition of SCN- Can be negligible. The adsorption amount of, SCN-onto the TG increased with increasing HCl concentration, indicating that SCN- is adsorbed onto the TG through the electrostatic attraction between anionic SCN- and the protonated hydroxy groups in the TG at higher HCl Concentrations. Using the resultant SCN-TG and the TG, We have conducted the Pd(II) adsorption experiment at molar level concentrations of HCl and found that the SCN-TG can adsorb pd(II) efficiently, :whereas the TG adsorbs almost no Pd(II).,Besides, the adsorbability of the SCN-TG for Pd(II) decreased only slightly with increasing HCl concentration up., to at least 5 M.