The Cretaceous-Miocene Shimanto temne of southern Japan is well-known geologically，but comparatively few geochemical studies have been made and comprehensive whole-rock data are scarce．This report contains whole-rock XRF analyses of 100 sandstones and mudstones spanning the stratigraphic range of the Shimanto sequence in Kii Peninsula，Wakayama Prefecture．Data include major elements and 19 trace elements（As，Ba，Ce，Cr，Cu，Ga，La，Nb，Ni，Pb，Rb，Sc，Sr，Th，U，V，Y，Zn and Zr）．Seven analyses of post-Shimanto sediments（Tanabe and Kumano Groups）are also included．Interpretation of the data in terms of provenance and evolution of the terrane will be published elsewhere．