Provided is a surgical tool insertion aid with which simultaneous use of multiple surgical tools is possible, and with which the surgical tools are independently exchangeable during surgery. The surgical tool insertion aid (1) is of tubular shape designed to aid insertion of surgical tools (11, 13) into the body, and is provided with: an inner tube (2) into the interior of which the surgical tools (11, 13) are insertable, and which is insertable into the surgical tool insertion aid (1) and a plurality of guide members (3) extending in the axial direction from the distal end side towards the basal end side, on the inside peripheral surface of the surgical tool insertion aid (1). The inner tube (2) is provided to the outside peripheral surface thereof with engaging members (4) for slidably engaging the guide members (3).本發明在提供一種,可同時使用複數個處置具,並且,在施術中可個別更換處置具之處置具插入輔助具。一種輔助處置具(11、13)插入體內的筒狀的處置具插入輔助具(1),其具備有:內管(2),其係內部可插入處置具(11、13),並且可插入到處置具插入輔助具(1);以及複數個引導構件(3),該複數個構件在處置具插入輔助具(1)的內周面從前端側到基端側延伸設置在軸向,內管(2)在外周面具備有和引導構件(3)卡合且可滑動的卡合構件(4)。4‧‧‧卡合構件3‧‧‧引導構件2a‧‧‧內管8‧‧‧外管2‧‧‧內管2c‧‧‧內管6‧‧‧第1引線構件7‧‧‧第2引線構件2b‧‧‧內管9a‧‧‧氣囊構件9b‧‧‧氣囊構件
