PROBLEM TO BE SOLVED: To provide a balloon with a mounting jig, a package, and a method for mounting the balloon, which can reduce the burden on an operator when mounting the balloon on an insertion portion of an endoscope. A balloon with a mounting jig is a balloon with a mounting jig that includes a mounting jig for mounting the balloon on an endoscope insertion portion and the balloon, and the balloon is provided at one end of the balloon. It has a first cylinder portion, a second cylinder portion provided at the other end of the balloon, and a balloon body arranged between the first cylinder portion and the second cylinder portion, and the mounting jig has an internal view. It has a first ring body and a second ring body having an inner diameter larger than the outer diameter of the mirror insertion part, and elastically deforms the first cylinder part to the outside of the first ring body so that the diameter is larger than the natural state. It is arranged, and the second cylinder portion is elastically deformed and arranged on the outside of the second ring body so that the diameter is larger than that in the natural state. [Selection diagram] Fig. 3【課題】バルーンを内視鏡の挿入部に装着する際の作業者の負担を軽減できる装着治具付きバルーン、包装体、及びバルーン装着方法を提供する。【解決手段】装着治具付きバルーンは、内視鏡挿入部にバルーンを装着するための装着治具と、バルーンとを備える装着治具付きバルーンであって、バルーンは、バルーンの一端に設けられる第１筒部と、バルーンの他端に設けられる第２筒部と、第１筒部と第２筒部との間に配置されたバルーン本体と、を有し、装着治具は、内視鏡挿入部の外径より大きな内径を有する第１リング体と第２リング体とを有し、第１リング体の外側に第１筒部を自然状態よりも拡径した状態に弾性変形させて配置し、第２リング体の外側に第２筒部を自然状態よりも拡径した状態に弾性変形させて配置する。【選択図】図３
