The present invention addresses the problem of providing a surgical instrument for a surgery assistance robot, with which it is possible to reduce the risks of failure and malfunction. The surgical instrument (1) according to the present invention is provided with: an electrically-conductive cord body (70) formed in a cord-like shape； an outer shell (10) which has a shape that covers the circumference of the cord body and which is electrically conductive； a first insulation part (30) and a second insulation part (40) which are formed of a material having a higher insulating capacity than the cord body and the outer shell； a protrusion part (50) into which the cord body is to be inserted and that protrudes from a protrusion insulating part (30), which is one of the first and second insulating parts, toward a recess insulating part (40), which is the other of the first and second insulating parts； a leading-end part (20) which is disposed apart from the recess insulating part and the outer shell, is electrically conductive, and is bendable by tension of the cord body having one end connected thereto； and a power-supply cable (60) which is a cord-like member disposed inside the first and second insulating parts and which is for supplying electric power to the leading-end part from the outside.La présente invention aborde le problème de la fourniture d'un instrument chirurgical pour un robot d'assistance chirurgicale, avec lequel il est possible de réduire les risques de défaillance et de mauvais fonctionnement. L'instrument chirurgical (1) selon la présente invention est pourvu : d'un corps de cordon électroconducteur (70) formé sous une forme de type cordon ； d'une coque externe (10) qui a une forme qui recouvre la circonférence du corps de cordon et qui est électroconductrice ； d'une première partie d'isolation (30) et d'une seconde partie d'isolation (40) qui sont formées d'un matériau ayant une capacité d'isolation supérieure à celle du corps de cordon et de la coq
