the present invention provides a medical instrument which is capable of reducing damage , such as cutting of a wire , to the medical instrument even if excessively large load is applied to an inserting portion . a medical instrument including : a deformable portion ; a wire configured to deform the deformable portion ; a driving unit configured to drive the wire ; a drive control unit configured to control the driving unit ; and a load detecting unit configured to detect load applied to the deformable portion , wherein when the load detected by the load detecting unit exceeds a threshold value , the drive control unit controls the driving unit to retain posture of the deformable portion .