To provide a sewing direction converting device enabling a sewing machine to sew corners by arbitrarily converting the sewing direction on the way of sewing, to prevent the needle thread from sticking out in converting the direction, and to produce a corner-sewing product excellent in the appearance and quality by sewing/pressing the loop-shaped parts of the needle thread with the looper thread.

In this sewing machine, a claw part 16 of the throat plate 6 is moved in the direction opposite to the sewing direction at the same time as the presser foot is lifted, interlocking with the rotation/stopping of the sewing machine when an article to be sewn reaches the position to convert the sewing direction in the ordinary straight sewing, and the needle thread 18, the decoration thread 19 and the looper thread 21 can be loosened. And a thread guide nearly open angle shape from a flat view is formed at the top of the nail part 16 of the throat plate 16 for collectively guiding the needle thread 18 coming out of the claw part 16 in conversing the direction of the article to be sewn 50 to the center between the juxtaposed needle location parts 15.