Endoscopic treatment instrument

An endoscopic treatment instrument comprising:

• a flexible sheath;
• an operation member inserted in the sheath such that the operation member is axially slideable with respect to the sheath;
• a treatment section provided at a distal end portion of the operation member and being slideable from/in the sheath;
• a proximal-side operation section provided at a proximal end portion of the sheath, the operation section having a slider member, which slides the operation member in an axial direction of the sheath, and a rotation drive section which rotates the treatment section about the axis of the sheath;
• and
• a direction adjusting section which adjusts a direction of the treatment section, the direction adjusting section having a rotation restriction section which restricts rotation of the treatment section about an axis thereof, and the direction adjusting section moving the treatment section between a rotation restriction position where rotational restriction is effected by the rotation restriction section, and a restriction release position where the treatment section is made rotatable about the axis of the sheath relative to the sheath, in accordance with an advancing/retreating operation of the operation member by the slider member.