Means for preventing the sewing slip of the sewing object of the conventional sewing machine have not been satisfied. Thus, the needle plate 5 having the needle hole 0 through which the needle 4 penetrates the sewing machine, and on the needle plate 5 on the square and both sides of the needle hole 0 with respect to the advancing direction of the object P, Q. The sewing machine of the sewing machine provided with the sending and receiving gear 16 which presses out and the pressing tool 7 which presses the to-be-sealed object at the time of sewing, are located in the upper part of the needle hole 0, and are formed. In the sewing slip prevention device of the object, the other two racks (16a) of the sending teeth (16) corresponding to the rack (16b) located in front of the needle hole (0) in the forward direction of the sending teeth (16) While setting higher than the sending values 16a and 16c corresponding to (16c), the convex portion 5d is formed in the portion immediately after the needle hole 0 with respect to the advancing direction of the needle plate 5. It is characterized by being installed.
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