To provide a method for dyeing a polyester-based conjugated fiber fabric to produce the dyed polyester-based conjugated fiber fabric having excellent elongation characteristic, dimensional stability and softness.

This method for dyeing the polyester-based conjugated fiber fabric, comprising dyeing the fabric comprising side-by-side type or eccentric sheath-core type conjugated polyester-based conjugated fibers, wherein at least one layer of each conjugated fiber is a layer consisting mainly of polytrimethylene terephthalate, is characterized in that the thermal set of the fabric before dyed is carried out at a temperature of 130 to 170°C at a tentering rate of -20 % to +20 % and at an over-feeding rate of -20 % to +20 % in the longitudinal direction.