Provided are a thermal transfer yellow ink and a thermal transfer sheet capable of providing a thermal transfer recorded product exhibiting a clear yellow tone with a high density by low energy and having an excellent color tone and light resistance, and also capable of exhibiting a favorable green color tone with a high density when mixed with cyan.Provided are a dye composition characterized by comprising a dye having an arylidene pyrazolone skeleton and a dye having a bispyrazolone methine skeleton; a thermal transfer ink characterized by comprising a dye having an arylidene pyrazolone skeleton, a dye having a bispyrazolone methine skeleton, and a medium; and a thermal transfer sheet comprising a substrate and a colorant layer formed thereon, wherein the colorant layer comprises a dye having an arylidene pyrazolone skeleton and a dye having a bispyrazolone methine skeleton.