To provide a blended yarn which has tension.stiffness and dry hand touch and has an excellent natural surface effect by splashed pattern-like same color difference or heterochromic color difference, and to provide a method for producing the same.

This blended yarn in which a thick and thin filament yarn A and a thick and thin filament yarn B and a multi-filament yarn C are integrally interlaced is characterized in that the blended yarn has a splashed pattern-like same color difference or color difference comprising a dark color, a neutral color and a pale color when dyed, and that the peak value of the spectrogram of the blended yarn is 5 to 20 cm.