A thermal transfer sheet includes coloring material layers D1, D2, and D3. Transferred images respectively formed by the coloring material layers D1, D2, and D3 have a value C defined by mathematical formula 1 of less than 12, and colorimetric values P (a*, b*) defined by mathematical formulae 2 and 3 different from one another: C=([a*]2+[b*]2)0.5   (mathematical formula 1) where C represents chroma and a* and b* each represent a colorimetric value equivalent to L*=38, [a*]=(ay−ax)/(Ly−Lx)*(38−Lx)+ax   (mathematical formula 2), and [b*]=(by−bx)/(Ly−Lx)*(38−Lx)+bx   (mathematical formula 3) where Lx, ax, bx, Ly, ay, and by represent colorimetric values at adjacent step Sx and step Sy near L*=38 when a stairstep image is formed by transfer.