To easily set an outlet seam width just by matching the cloth end of a working cloth with a reference line set on a sewing machine side, to visually confirm the outlet seam width through display, to apply outlet seam width setting even in the case of using an optional presser foot and to use the outlet seam width from the left end or right end of the presser foot to a needle location position.

The width dimension Fw and a reference position corresponding dimension A are rewritably stored for the respective kinds of the presser foot 7 in a flash memory, a moving dimension to the reference position P(0) of a sewing needle 6 at the needle hole 7a of the presser foot 7 when the outlet seam width is set is obtained, a distance from the left end LE or right end RE of the presser foot 7 to a stitch formation position is obtained by an arithmetic operation and displayed based on the reference position corresponding dimension A from the left the end LE or right end RE of the presser foot 7 corresponding to the reference position P(0) of the sewing needle 6, and the cloth end of the working cloth is sewn while being matched with the left end LE or right end RE of the presser foot 7. Thus, the distance from the left end LE or right end RE of the presser foot 7 to the stitch formation position is turned to the outlet seam width and sewing is easily performed.