Provided is a suturing device that can easily and accurately form a knot or a seam by means of mechanical action that is based on a simple operation. The present invention includes: a long cylindrical member 12 a long needle 30 that holds a first string-shaped member L1, that is provided inside the cylindrical member 12 so as to be capable of moving reciprocally in the long direction of the cylindrical member 12 and of being exposed from a side surface of the cylindrical member 12, and that forms a loop in the first string-shaped member L1 a recess 34 that is formed in the side surface of the cylindrical member 12, that exposes the needle 30, and that has an inner wall surface for which the shortest distance therefrom to the path K of the tip of the needle 30 continuously changes in the movement direction of the needle 30 and a shuttle 26 that has a holding part 62, which holds a second string-shaped member L2, and that, at a position that is further to an advancement-end side of the path K of the needle 30 in the long direction of the cylindrical member 12 than the recess 34 in the cylindrical member 12, moves inside the cylindrical member 12 and thereby passes the second string-shaped member L2 as held by the holding part 62 through the loop LP formed by the needle 30.Linvention concerne un dispositif de suturage qui peut facilement former un nœud ou une couture avec précision au moyen dune action mécanique qui se base sur une opération simple. La présente invention comprend : un long élément cylindrique 12 une longue aiguille 30 qui retient un premier élément L1 en forme de chaîne, qui est disposé à lintérieur de lélément cylindrique 12 de façon à pouvoir se déplacer selon un mouvement de va-et-vient dans le sens long de lélément cylindrique 12 et à être exposé à partir dune surface latérale dudit élément cylindrique 12, et qui forme une boucle dans le premier élément L1 en forme de chaîne un renfoncement 34 qui est formé dans la surface latérale de lélément cyli
