PROBLEM TO BE SOLVED: To provide a volatilization container capable of simply performing the switching operation from a tightly closed state before use to a volatilizable state after opening, and capable of easily distinguishing the tightly closed state and the volatilizable state.SOLUTION: There is provided a volatilization container comprising a container body 1, an inside plug body tightly closing the container body 1, and an overlaying cap 40 having a volatilization hole 45 and mounted rotatably mounted to the head of the inside plug body. The inside plug body has: a first inside plug 10 having a sleeve 12 through which a volatile agent passes and a window part 15, and mounted to a mouth cylindrical part 2; a second inside plug 20 having a blocking piece 26 blocking the window part 15; and a coupling inside plug 30 connecting the first and second inside plugs. Besides, a weakened part 25 breakably connecting the blocking piece 26 is formed on the periphery of the blocking piece 26, and a locking mechanism
