Patent ID: 8443744

Claim:
A sewing machine comprising: a thread tension adjustment portion that adjusts a thread tension, the thread tension being a tension of an upper thread that is configured to be supplied to a sewing needle; a feed portion that is configured to feed a sewing object in a first direction and in a second direction, the second direction being a direction opposite to the first direction; and a control portion that is configured to control the thread tension adjustment portion and the feed portion such that a first stitch and a second stitch are configured to be formed alternately on the sewing object, the first stitch including only a stitch in which an interlacing point of the upper thread and a bobbin thread that is a different color to the upper thread is lower than a top surface of the sewing object, the second stitch including at least one set of a first section and a second section, the first section being a section in which the interlacing point and the bobbin thread can be pulled out, by the thread tension, in the first direction on the top surface of the sewing object, the second section being a section in which the bobbin thread can be pulled out in the second direction, and at least part of the second section overlapping with the first section; wherein the control portion sets a first tension value that is a predetermined value as the thread tension in a case where the first stitch is sewn and sets a second tension value as the thread tension in a case where the second stitch is sewn, and controls the thread tension adjustment portion in accordance with the set thread tension, the second tension value being larger than the first tension value.