PROBLEM TO BE SOLVED: To volatilize stably a volatile agent, while simplifying a structure.SOLUTION: A volatilizer 10 includes: a container body 11 on which a vaporization hole 11a for emitting vaporized gas from a volatile agent M stored inside, therethrough to the outside and an impregnation body 12 arranged in the container body 11, for sucking the volatile agent M in the container body 11 from the lower side which is a bottom 13 side of the container body 11 along a container axis O direction to the upper side which is a vaporization hole 11a side. The volatilizer 10 is provided with a widening part 16 swollen to the outside in the radial direction with the impregnation body 12 locked on the inner peripheral surface, on a separated part to the upper side from the bottom 13 on a shell part 14 of the container body 11.
