PROBLEM TO BE SOLVED: To provide a tube joining device capable of suppressing an inadvertent movement of a release member for releasing the holding of a pressing member to a lid when the lid is opened. SOLUTION: The tube joining device is capable of opening and closing the pedestal 212 provided with a groove portion capable of holding the tube after fusing the ends of the tubes T1 and T2 and then joining the welded ends by exchanging the fused ends. The lid part that exposes the groove part to the outside when opened and isolates the groove part from the outside when closed, and the lid part and the pedestal are rotatably provided respectively, and when the lid part is closed, the tube is opened. The lid-side pressing portion 253 and the housing-side pressing portion that can be pressed, the holding member 226 that holds the lid-side pressing portion on the lid portion when the lid portion is opened, and the pedestal side of the lid portion when the lid portion is opened. A release member 227 that has a protrusion 227c that protrudes from the end face and that releases the holding of the lid-side pressing portion when the lid is closed, and a release member that is attached to the lid adjacent to the release member and opens the lid. And a mounting member 228 having a protection portion 228a for protecting the protruding portion. [Selection diagram] Figure 8【課題】押付け部材の蓋部に対する保持を解除する解除部材が蓋部を開いた際に不用意に動くことを抑制可能なチューブ接合装置を提供する。【解決手段】チューブ接合装置は、チューブＴ１、Ｔ２の端部を溶断した後、溶断した端部を入替えて接合し、チューブを保持可能な溝部を設けた台座２１２と、溝部に対して開閉可能に構成され、開いた際に溝部を外部に露出し、閉じた際に溝部を外部から隔離する蓋部と、蓋部及び台座に各々回転可能に設けられ、蓋部を閉じた際にチューブを押圧可能な蓋側押付け部２５３及び筐体側押付け部と、蓋部を開いた際に蓋部に蓋側押付け部を保持する保持部材２２６と、蓋部を開いた際に蓋部の台座側の端面から突出する突出部２２７ｃを備え、蓋部を閉じた際に蓋側押付け部の保持を解除する解除部材２２７と、解除部材に隣接して蓋部に取付けられ、蓋部を開いた際に突出部を保護する保護部２２８ａを備えた取付部材２２８とを有する。【選択図】図８
