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).