PROBLEM TO BE SOLVED: To facilitate suturing of a vaginal stump after hysterectomy and prevent leakage of pneumoperitoneum gas from the vagina at the time of suturing. SOLUTION: A vaginal stump suture assisting tool 1 is provided at a proximal end of a main body 10 and a substantially cylindrical body 10 which is inserted from an opening of a vagina 102 and supports a vaginal stump 102a from the inside by a tip 10a. And a grip 20. On the outer peripheral surface of the main body 10, a gas leakage prevention portion (annular protrusion 14, tapered surface 13a) having a larger diameter than the tip 10a is provided. [Selection diagram] Figure 1【課題】子宮摘出後の膣断端の縫合を容易化すると共に、縫合時の膣からの気腹ガスの漏れ出しを防止する。【解決手段】膣断端縫合補助具１は、膣１０２の開口部から挿入され、先端１０ａで膣断端１０２ａを内側から支持する略円筒状の本体１０と、本体１０の基端に設けられたグリップ２０とを備える。本体１０の外周面に、先端１０ａよりも大径なガス漏れ防止部（環状突起１４、テーパ面１３ａ）が設けられる。【選択図】図１
