[Problem] To provide a chemical agent volatizer with which it is possible to use up all of a chemical agent in a container, even in cases in which rod-shaped volatizer elements are used. [Solution] The present invention is provided with: a container having an internal space enclosed by a bottom wall and a peripheral wall, having an opening at the top, and containing a liquid chemical agent within the internal space； and a plurality of rod-shaped volatizer elements which are inserted into the internal space from the opening such that one end protrudes from the opening. The container is constituted such that a straight line connecting the peripheral edge of the inner wall surface of the bottom wall, and the inner peripheral edge of the opening, is situated in the internal space, and the bottom wall has a protrusion protruding towards the center from the peripheral edge of the inner wall surface of the bottom wall.
