An endoscope system (11) includes an insertion portion (17) inserted in a body cavity and provided with a channel through which a treatment tool is inserted, and an operation portion connected to the insertion portion (17) for operating the insertion portion (16), and an operation lever (63) provided on the operation section (16) and transmitting the operation force to the treatment instrument (13) by holding the treatment instrument (13) A flexible tube (55) formed with a mirror (12), an insertion path (58) for inserting a treatment instrument (13) inserted into a channel of the insertion section (17) A connecting portion that is connected to one end of the flexible tube and is formed so that the channel and the insertion passage are connected to each other, and a flexible tube that is attached near the other end of the flexible tube, And an auxiliary tool (14) for assisting the movement of the treatment instrument including a holding section (56) for holding the operation section (16) so that the other end of the operation section (16) faces the side on which the operation lever (63) is disposed .内視鏡システム(11)は、体腔内に挿入され内部に処置具を挿通するチャンネルを設けた挿入部(17)と、挿入部(17)に接続され挿入部(17)を操作する操作部(16)と、操作部(16)に設けられ処置具(13)を保持して移動することで前記操作の力を処置具(13)に伝達する操作レバー(63)と、を有する内視鏡(12)と、挿入部(17)のチャンネルに挿入される処置具(13)を挿通するための挿通路(58)が形成された可撓管(55)と、可撓管(55)の一端に接続されるとともに前記チャンネルと挿通路(58)とが連結するように形成された連結部(45)と、可撓管(55)の他端近傍に装着され可撓管(55)の他端が操作レバー(63)が配置された側に向くように操作部(16)を保持する保持部(56)と、を有する処置具の移動を補助する補助具(14)と、を備える。
