present treatment instrument holding apparatus, the insertion portion of the flexible that the treatment instrument channel is formed by the plurality of treatment instrument and a distal end and a proximal end is inserted, the plurality of treatment instruments into the treatment instrument channel a drive unit for each of the forward and backward in the treatment instrument channel, an operation unit for operating the plurality of treatment instrument, the treatment instrument in a state projected from the distal end of the treatment instrument channel of the plurality of treatment instruments and a control unit for controlling the amount of projection of the treatment instrument channel.本処置具保持装置は、先端と基端とを有し前記複数の処置具が挿通される処置具チャンネルが形成された軟性の挿入部と、前記処置具チャンネルに前記複数の処置具の各々を前記処置具チャンネル内で進退させる駆動部と、前記複数の処置具を操作する操作部と、前記複数の処置具のうち前記処置具チャンネルの先端から突出した状態にある処置具の前記処置具チャンネルからの突出量を制御する制御部と、を有する。
