The inventive sewing device for overcasting a mechanical twisted suture comprises a body (1) provided with a spiral needle (12) which is rotatable and translationally displaceable and is connected to a drive for rotating it, clamping jaws (6, 7) which are arranged on the distal end of the body for fixing the tissue parts to be sewed and provided with a unit for controlling the relative position thereof. The spiral needle (12) is designed in the form of an atraumatic or a hollow needle, is provided with a thread arranged therein, comprises at least two complete turns and is positioned in such a way that it is displaceable in a direction along the clamping jaws (6, 7) at a distance equal to or greater than the entire length of the spiral. The device comprises a nest (17) for catching the pointed end of the needle and/or the thread at the end of the suture and means for extracting the needle from the tissue. Said device makes it possible to reduce the trauma of sewed biological tissue, to improve the quality of the applied suture and to increase the operational reliability of the device by excluding failures in the needle displacement.