The invention has for its object to provide a surgical robot that makes sure good enough operation even when it is difficult to have an instantaneous grasp of a three-dimensional position relationship between an affected site and a treatment tool or have a full understanding of force interacting between the affected site and the treatment tool. The surgical robot 1 disclosed herein includes an operating assembly, a distal end portion that moves depending on an amount of operation by the operating assembly, a treatment tool located at said distal end potion, a detection sensor located near the distal end portion to detect states of the distal end portion, and an actuation mode changeover portion (Steps S102, S103 and S104) configured to make a change to actuation modes depending on the result of detection by the detection sensor.
