Provided are an endoscope surgical device and an outer sleeve with which, in a configuration where an endoscope is made to be movable back and forth in tandem with the back-and-forth movement of a surgical tool, the state of a distal end of a surgical tool can be easily checked while achieving a decrease in the diameter of the outer sleeve, thereby improving the efficiency of a surgical operation. An endoscope insertion passage (306) into which an endoscope is inserted and a surgical tool insertion passage (308) into which a surgical tool is inserted are provided in an outer sleeve (300) which is to be inserted through a body wall, the surgical tool insertion passage (308) being provided parallel to and the endoscope insertion passage (306) being provided obliquely to a reference axis (300a) of the outer sleeve (300). Inside the outer sleeve (300), arranged so as to be movable in a forward-backward direction thereof is a slider that is engaged with the endoscope and the surgical tool which have been inserted into the respective insertion passages and that links together and causes the endoscope and the surgical tool to move back and forth of the outer sleeve (300). An endoscope engagement portion that is engaged with the endoscope in the slider can be moved in an up-down direction, and moves up and down along the position of the oblique endoscope insertion passage (306) together with the movement of the slider in the forward-backward direction.L'invention concerne un dispositif chirurgical d'endoscope et un manchon externe, avec lesquels, dans une configuration dans laquelle un endoscope est constitué de façon à être mobile vers l'avant et vers l'arrière en tandem avec le mouvement de va-et-vient d'un outil chirurgical, l'état d'une extrémité distale d'un outil chirurgical peut être facilement vérifié tout en obtenant une diminution du diamètre du manchon externe, en améliorant ainsi l'efficacité d'une opération chirurgicale. Un passage d'insertion d'endoscope (306)
