The endoscope apparatus 1 includes an endoscope 10 including a first operation unit 12 that is connected to a first insertion unit 11 that is inserted into a subject, and a subject through the first insertion unit 11. The medical device 20 includes a second operating portion 22 that is connected to the second inserting portion 21 that is inserted into the medical device 20, and the second operating portion 22 is provided with at least one locking portion 41. A second operation of the medical device having at least one of the three end portions 34, 35, 36 having a locked portion 38 that is locked to the locking portion and wound around the endoscope 10. And a band-shaped body 31 for holding and fixing the part in a state where at least three ends thereof are connected to the second operation part.内視鏡装置１は、被検体に挿入される第１の挿入部１１に連設された第１の操作部１２を備えた内視鏡１０と、第１の挿入部１１を介して被検体に挿入される第２の挿入部２１に連設された第２の操作部２２を備え、第２の操作部２２に少なくとも１つの係止部４１が設けられた医療デバイス２０と、柔軟性を備え、少なくとも３つの端部３４，３５，３６のうちの少なくとも１つが係止部に係止される被係止部３８を有し、内視鏡１０に巻き付けて、医療デバイスの第２の操作部を少なくとも３つの端部が第２の操作部に接続した状態で保持固定する帯状体３１と、を具備する。
