PROBLEM TO BE SOLVED: To provide a connecting device for a medical tube in which a liquid other than a medical tube does not come into contact with a flowing liquid during use. A connection device includes a first fixed tube (5) holding an end of a first medical tube (3) in a folded state, and a first case (7) housing the first fixed tube. The first fixed tube 15 that holds the first element 9 and the end of the folded second medical tube 13 and the second fixed tube 15 is housed and can be inserted into the first case 7 A second element 19 having a second case 17 is included. In the state where the second case is inserted into the first case and the first element and the second element are combined, the first fixed tube and the second fixed tube are combined with the first medical tube and the first medical tube. The first medical tube and the second medical tube are combined by pushing the second medical tube in the direction in which these ends are combined. [Selection diagram] Figure 1【解決課題】使用時に医療用チューブ以外の部分と流液が接触しない医療用チューブの接続装置を提供する。【解決手段】接続装置は，折り返した状態の第１の医療用チューブ３の端部を保持する第１の固定管５と，第１の固定管を収容する第１のケース７とを有する第１の要素９，及び折り返した状態の第２の医療用チューブ１３の端部を保持する第２の固定管１５と，第２の固定管１５を収容し第１のケース内７に挿入可能な第２のケース１７とを有する第２の要素１９を含む。第２のケースが第１のケース内に挿入されて第１の要素と第２の要素が組み合わされた状態では，第１の固定管と第２の固定管が，第１の医療用チューブと第２の医療用チューブをこれらの端部が結合する方向に押すことで，第１の医療用チューブと第２の医療用チューブとが結合する。【選択図】図１
