PROBLEM TO BE SOLVED: To provide a check valve assembly having excellent assembly workability. SOLUTION: An upper member 20, a check valve 30, and a lower member 40 are provided, and the upper member 20 is provided on the plate-shaped member and the back surface of the plate-shaped member to fix the upper member 20 to the lower member 40. The fitting portion is a plate, and the plate-shaped member has a circular opening provided in the center and a first missing portion provided at the end of the circular opening. The main body and the upper end of the check valve 30 having a first cylindrical body 25 protruding from the back surface of the shaped member and a fitting claw 26 protruding from the outer wall of the first cylindrical body 25, and having a slit 33 at the lower end 31b. It has a flange portion 34, and a lower member 40 has a second cylindrical body 41 and a side wall flange portion 42 provided on the outer periphery of the second cylindrical body 41, and an upper member is provided on the side wall of the second cylindrical body 41. A fitting hole 43 for fitting with the fitting claw 26 of 20 is provided, and a locking portion 44 for locking the upper end flange portion 34 of the check flow prevention valve 30 is provided on the inner wall of the second cylindrical body 41. Preventive valve assembly 10. [Selection diagram] FIG. 11【課題】組立作業性に優れる逆流防止弁組立体を提供する。【解決手段】上部材20と、逆流防止弁30と、下部材40とを備え、上部材20が、板状部材と、板状部材の裏面に設けられ上部材20を下部材40に固定するための嵌合部22とを有し、板状部材が、中央に設けられた円形開口と、円形開口の端部に設けられた第一切欠部とを有し、嵌合部が、板状部材の裏面に突出する第一円筒体25と、第一円筒体25の外壁に突出する嵌合ツメ26とを有し、逆流防止弁30が、下端31bにスリット33を有する本体部と上端フランジ部34とを有し、下部材40が、第二円筒体41と第二円筒体41の外周に設けられた側壁フランジ部42とを有し、第二円筒体41の側壁に、上部材20の嵌合ツメ26と嵌合する嵌合孔43が設けられ、第二円筒体41の内壁に、逆流防止弁30の上端フランジ部34を係止する係止部44が設けられている逆流防止弁組立体10である。【選択図】図１１
