PROBLEM TO BE SOLVED: To provide an excellent-operability/strength surgical instrument having small risk of part detachment while securing noninvasive properties.SOLUTION: This surgical instrument includes: a main shaft part a first grip part a first bending part bending the first grip part to the main shaft part a second grip part a second bending part bending the second grip part to the first grip part a third grip part and a third bending part bending the third grip part to the second grip part. When equalizing extension directions of the first grip part, the second grip part, and the third grip part, bent faces of the first bending part and the third bending part are identical, and the bent faces of the first bending part and the second bending part are perpendicular.
