When a bendable medical instrument is used, the present invention reduces a risk that a body of the medical instrument is damaged.The present invention provides a medical instrument which includes: a deformable portion a wire configured to deform the deformable portion and a driving unit configured to transmit driving force to the wire, wherein: the medical instrument includes a load detecting unit configured to detect load applied to the deformable portion and when the load detected by the load detecting unit exceeds a threshold value, the driving unit breaks connection between the wire and the driving force.
