To provide a differential feed sewing machine which significantly improves the workability along with a higher sewing quality preventing the generation of wrinkling, tucking in the sewn products by performing the sewing varying the degree of taking in gradually at a switching part of sewing sections.

The degree of upper feeding is increased or decreased by a specified unit differential quantity B each specified unit length A set by a unit value setting means 15, at the shift to the degree of upper feeding in the subsequent section U2 from that in the section U1 before the adjacent sections U so as to accomplish the sewing by gradually varying the degree of upper feeding.