Provided is a medical instrument guiding device that enables a technician to easily obtain desired images via a simple configuration. A sheath tube (100) that punctures a body wall is provided with an endoscope insertion hole (120) through which an endoscope (10) is inserted, and a surgical instrument insertion hole (122) through which a surgical instrument (50) is inserted. A linking mechanism (134), which moves the endoscope (10) back and forth in concert with back and forth movement of the surgical instrument (50), is provided inside the sheath tube (100). The linking mechanism (134) is provided with an endoscope-side roller (200) linked in contact with an endoscope insertion part (12), and a surgical instrument-side roller (202) linked in contact with a surgical instrument insertion part (52). The rollers (200, 202) rotate in concert with each other. The surgical instrument-side roller (202) and the endoscope-side roller (200) thus rotate in the opposite direction to the back and forth movement of the surgical instrument insertion part (52), and the endoscope insertion part (12) moves back and forth. In addition, play is provided to the surgical instrument insertion part (52), whereby the endoscope (10) is not linked to the movement of the surgical instrument (50).L'invention concerne un dispositif de guidage d'instrument médical, qui permet à un technicien d'obtenir facilement des images souhaitées par l'intermédiaire d'une configuration simple. Un tube de gaine (100), qui perfore une paroi corporelle, comprend un trou d'introduction d'endoscope (120) à travers lequel est introduit un endoscope (10), et un trou d'introduction d'instrument chirurgical (122) à travers lequel est introduit un instrument chirurgical (50). Un mécanisme de liaison (134), qui déplace l'endoscope (10) d'avant en arrière de concert avec un déplacement d'avant en arrière de l'instrument chirurgical (50), est disposé à l'intérieur du tube de gaine (100). Le mécanisme de liaison (134) comp
