PROBLEM TO BE SOLVED: To provide a tube joining device capable of preventing the positions of the tubes from being unintentionally displaced when two tubes are pressed against each other. A tube joining device (1) is provided with a casing (10), a lid portion (22) that can move relatively toward and away from the casing, and an operation that the lid portion relatively approaches the casing. , And a tube pressing portion 25 that presses the first tube T1 and the second tube T2 against each other. The tube pressing portion includes a lid side pressing portion 251 provided on the lid portion and a housing side pressing portion 252 provided on the housing side. The lid-side pressing portion includes a lid-side pressing portion 251a that applies a pressing force to the first tube and the second tube from the lid portion side, and a lid-side protruding portion 251b that projects toward the housing from the lid-side pressing portion. Prepare The housing-side pressing portion includes a housing-side pressing portion 252a that applies a pressing force to the first tube and the second tube from the housing side, and a housing-side protruding portion 252b that projects from the housing-side pressing portion toward the lid portion. . The lid-side protrusion and the housing-side protrusion are provided at positions facing each other when the lid is closed, and surround at least a part of the peripheral surfaces of the first tube and the second tube. [Selection diagram] Fig. 12【課題】２本のチューブを互いに押付ける際に、不用意にチューブの位置がずれるのを防止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１は、筐体１０と、筐体に対して相対的に接近－離反移動可能な蓋部２２と、蓋部が筐体に対して相対的に接近する動作に伴い、第１チューブＴ１と第２チューブＴ２を互いに押し付けるチューブ押し付け部２５と、を有する。チューブ押し付け部は、蓋部に設けられる蓋側押し付け部２５１と、筐体側に設けられる筐体側押し付け部２５２と、を備える。蓋側押し付け部は、第１チューブおよび第２チューブに蓋部側から押圧力を付与する蓋側押圧部２５１ａと、蓋側押圧部から筐体に向かって突出する蓋側突出部２５１ｂと、を備える。筐体側押し付け部は、第１チューブおよび第２チューブに筐体側から押圧力を付与する筐体側押圧部２５２ａと、筐体側押圧部から蓋部に向かって突出する筐体側突出部２５２ｂと、を備える。蓋側突出部と筐体側突出部は、蓋部が閉じられた状態では、互いに対向する位置に設けられて、第１チューブおよび第２チューブの周面の少なくとも一部を囲う。【選択図】図１２
