To propose a spout B which is fixed at an opening part 2 of a flexible container body A and is for taking out a stored substance, capable of smoothly perform a sterilization treatment or the like of the stored substance, simplifying the manufacturing process, and opening it by such a simple operation as twisting off a bung part to express an unused condition of the container.

A spout is equipped with a cylindrical main body part 10 for fixing the outer periphery and a cap 13 mounted removably on the main body part on the opening part 2 of the container body. The bung part 12 which is a cylindrical shape to which the lower end of the peripheral edge part is integrally connected to the main body part 10 through a thin-walled fracture part 17, and in which a partition wall 18 intercepting inside and outside of the main body part is horizontally provided inside, is provided in the cap.