Endoscopic treatment device

An endoscopic treatment device comprising:

• a sheath;
• a treatment portion provided at a distal end side of the sheath;
• a passage member provided in a distal end portion of the sheath and having a penetration hole extending along a longitudinal axis of the sheath;
• an operation member connected to the treatment portion;
• a first block portion configured to come into contact with a proximal end of the passage member when advancing the operation member;
• and
• a second block portion configured to come into contact with a distal end of the passage member when retracting the operation member.

An endoscopic treatment device comprising:

• a sheath;
• a pair of forceps pieces provided at a distal end side of the sheath;
• a support member provided in a distal end portion of the sheath and configured to support the pair of forceps pieces so as to freely open and close the pair of forceps pieces;
• a first member configured to come into contact with a proximal end of the support member when the pair of forceps pieces are in an open state;
• and
• a second member provided at a distal end side of the support member and configured to come into contact with a distal end of the support member when the pair of forceps pieces are in a closed state.