Treatment tool, treatment tool assembling method, and treatment tool disassembling method

A treatment tool comprising:

• a sheath extending along a longitudinal axis;
• a fixed gripping piece located distally relative to a distal end of the sheath;
• a movable gripping piece movably attached to either the sheath or the fixed gripping piece, the movable gripping piece including a first pin and a second pin;
• and
• a movement restricting portion that includes a drive portion configured to allow movement of the movable gripping piece in a first range and restrict movement of the movable gripping piece in a second range different from the first range,
• wherein:
• the movable gripping piece is attachable to and detachable from either the sheath or the fixed gripping piece at a movement position within the second range, and
• the first pin and the second pin are located in a slot provided on one of the sheath and the fixed gripped piece.