Bending treatment instrument operating portion

An operating portion connected with a device wire and a plurality of bending wires and used to operate a treatment instrument and bend a freely bendable, bending treatment instrument, the device wire being connected to the treatment instrument provided at a distal end of the bending treatment instrument and used to operate the treatment instrument and the plurality of bending wires being used to bend the bending treatment instrument, the operating portion comprising:

• an operating portion body;
• a guide unit penetrated by the device wire;
• a bending wire pulling unit connected with the bending wires and swingably assembled onto the guide unit;
• and
• a grip portion connected with the device wire and configured to be reciprocable in an axial direction of the bending wire pulling unit,
• wherein the operating portion body is detachably attached to a fixing base via a fixing base connecting portion,
• wherein a rotating device adapted to rotatably assemble the operating portion body onto the fixing base connecting portion is attached to the operating portion body, and the rotating device includes a fixing unit fixed to the fixing base connecting portion, a rotating portion rotatably assembled onto the fixing unit, and a rotation controller onto which the rotating portion is assembled, and
• wherein the bending wires are provided through the fixing unit, the rotating portion, and the rotation controller of the rotating device.