PROBLEM TO BE SOLVED: To provide a volatilization apparatus which can be prevented from going wrong during use.SOLUTION: A sheet 211 closing an upper opening 201 of a container body 31 is pulled out from a pull-out hole 23 to open the upper opening 201. Then, a suction part 312 of a volatilization body 131 of the container body 31 extends into the container body 31, and sucks up a liquid chemical 2 to a volatilization part 311 of the volatilization body 131. Thus, volatilization from the volatilization part 311 of the liquid chemical 2 is started.