Tissue sampling system of the present invention, the channel, the endoscope operation portion having a base end side opening is provided in the channel, suction conduit branched from the channel in the interior of the endoscope operation portion, and the channel an endoscopic device having a branch portion forming a substantially Y-shaped conduit shape with said suction conduit to form a shape that the channel is bent to a boundary portion between the suction conduit and provided. Also, tissue collection system of the present invention, the accessory operation portion connected to the proximal-side opening, sheath inserted connected to the channel in the treatment instrument operation unit, the needle tube which is movably inserted into the sheath and, a support which is connected to the distal end portion of the accessory operation portion covers the base end of the sheath, the distal end when the treatment instrument operation unit to the proximal-side opening is fixed is disposed in the bifurcation comprising a biopsy needle device having a pipe.本発明の組織採取システムは、チャンネル、前記チャンネルの基端側開口が設けられた内視鏡操作部、前記内視鏡操作部の内部において前記チャンネルから分岐する吸引用管路、及び、前記チャンネルと前記吸引用管路との境界部分であって前記チャンネルが屈曲した形状を形成し前記吸引用管路とともに略Y字状の管路形状を形成している分岐部を有する内視鏡装置を備える。また、本発明の組織採取システムは、前記基端側開口に接続される処置具操作部、前記処置具操作部に接続され前記チャンネルに挿通されるシース、前記シースに進退可能に挿通された針管、及び、前記シースの基端部を覆い前記処置具操作部の先端部に接続され、前記基端側開口に前記処置具操作部が固定されたときに先端が前記分岐部内に配される支持パイプを有する生検針装置を備える。
