To provide a feeder of a sewing machine capable of expanding a range of a differential feed ratio and having a transmission mechanism to a differential feed rod and a differential feed adjusting mechanism.

The differential feed adjusting mechanism 41 is provided with a differential feed adjusting link 40 movably supported to a spindle 45 at one end. The transmission mechanism 32 to the differential feed rod 4 turnably connects the other end of a first differential feed link 35 to an intermediate part P between a connecting point part 37 of a second differential feed link 36 to a second differential feed arm 34 and a connecting point part 38 thereof to the other end of the differential feed adjusting link 40. This constitution can largely change a difference of a swing angle of a differential feed rod 4 so as to expand the range of the differential feed ratio even in a same adjusting angle.