| 摘要 |
PROBLEM TO BE SOLVED: To provide a backflow preventing member which has a function of preventing a backflow of poured content to a storage body side when the content stored in the storage body is poured by suction operation or press operation.SOLUTION: A backflow preventing member 1 includes: a cylindrical main body part 10 having an outflow hole 10a opened to an inside of a cavity part 11; and an elastic adhering part 20 which is adhered to the cylindrical main body part 10, closes the outflow hole 10a, and has an opening part 20A. The cylindrical main body part 10 can be fitted to a cylinder part 55. The cylindrical main body part 10 and the elastic adhering part 20 are formed so that a gap G1, which is gradually narrowed as moving to a storage body side from the opening part 20A, is formed. When sucked from a pouring side, the content is poured from the opening part 20A by generating a convex flow in the gap G1, separating the elastic adhering part 20 from the cylindrical main body part 10, and thereby opening the closed outflow hole 10a. |
