PROBLEM TO BE SOLVED: To provide a medical measurement tool and surgical procedure system that enable tissue measurements in a body to be suitably performed.SOLUTION: A medical measurement tool 1 comprises a body that is formed so that it can be deformable into linear form and nonlinear form and it does not substantially elongate when receiving force in longitudinal direction, and engaging parts 20 that are provided at both ends of the body and locked to medical forceps 51, 52 detachably.