This aims to provide a volatilizing agent container for suppressing a deformation when a volatilizing agent solution is injected. The volatilizing agent container comprises a cylindrical container body (11) opened at least on its one side in the axial direction, and caps (12 and 13) for sealing the opening. The caps (12 and 13) include end face portions (12a and 13a) formed to cover the opening, and cylindrical inserted portions (12c and 13c) formed to extend axially from the end face portions (12a and 13a) to the inside of the container body (11). The end face portions (12a and 13a) have curved face portions (12b and 13b) curved to reduce the opening toward the inserted portions (12c and 13c), and connected to the inserted portions (12c and 13c).
