A medical system according to the present invention includes: a medical instrument 40 provided with a treatment portion 41 for performing treatment operations on living body tissue； a treatment portion displacement mechanism 60 for displacing the position of the treatment portion of the medical instrument； a treatment detection portion 20a that detects whether the treatment portion is in a treatment state or a non-treatment state； and a control portion 20 that controls displacement of the treatment portion by controlling the treatment portion displacement mechanism according to detection results from the treatment detection portion.
