In order to smoothly perform the opening and closing operation of the holding member and the delivery operation of the suturing needle, the suturing device includes a long shaft member, a pair of gripping members (11, 12), and a gripping member , And a delivery mechanism (15) for delivering the suture needle (3) with the suture needle (3), wherein the delivery mechanism (15) comprises fitting holes (11a, (3 a) of the outer peripheral surface of the suturing needle (3) by being towed toward the proximal side along the direction intersecting the axis of each fitting hole portion (11 a, 12 a) A swinging member (24) provided so as to be swingable around an axis orthogonal to the longitudinal axis, a pair of tension for transmitting tension for swinging the swinging member (24) Transmission members (19a, 19b) and an axial force accompanying oscillation of the oscillating member (24) are transmitted Comprises force transmitting member (18a, 18b) and, a holding state maintaining mechanism holding member (16, 17) is maintained in the recess (3c).把持部材の開閉動作と縫合針の受け渡し動作とを円滑に行うことを目的として、縫合器は、長軸部材と、一対の把持部材（１１，１２）と、把持部材（１１，１２）の間で縫合針（３）を受け渡す受け渡し機構（１５）とを備え、受け渡し機構（１５）が、各把持部材（１１，１２）に設けられ縫合針３を嵌合させる嵌合孔部（１１ａ，１２ａ）と、各嵌合孔部（１１ａ，１２ａ）の軸線に交差する方向に沿って基端側に牽引されることによって、縫合針（３）の外周面の凹部（３ｃ）内に挿入される保持部材（１６，１７）と、長手軸に直交する軸線回りに揺動可能に設けられた揺動部材（２４）と、揺動部材（２４）を揺動させる張力を伝達する一対の張力伝達部材（１９ａ，１９ｂ）と、揺動部材（２４）の揺動に伴う軸力を伝達する軸力伝達部材（１８ａ，１８ｂ）と、保持部材（１６，１７）を凹部（３ｃ）内に維持する保持状態維持機構とを備える。
