Medical device

A medical device comprising:

• a flexible tubular member;
• a rotating operation part that deflects a head of the tubular member in a first direction when rotating in positive rotation direction and deflects the head of the tubular member in a second direction when rotating in negative rotation direction opposite to the positive direction;
• a gripper that is gripped when the rotating operation part is rotated;
• and
• an O-ring mounted between the rotating operation part and the gripper produces frictional force in the direction opposite to the rotation direction of the rotating operation part between the rotating operation part and the gripper when the rotating operation part is operated to rotate, wherein
• at least two projections placed on an inner face of the gripper are in contact with the O-ring and adjust the frictional force in a direction opposite to a rotation direction of the rotating operation part.