PROBLEM TO BE SOLVED: To provide a volatilization vessel which prevents a volatilization agent volatilized from a volatilization element from adhering to a hand when an ejection pump is operated.SOLUTION: An adaptor member 20 has a side face with a mouth part 25 opened in the same direction as an ejection nozzle 38 of an ejection pump 30. The core body part 42 of a suction core 40 is disposed in a vessel body 10. A contact part 41 projects outward from the mouth part 25. A cover body 50 to be installed on the vessel body 10 allows the posture to be changed between a non-volatilization posture with a vent hole 57 facing a direction different from that of the ejection nozzle 38 and a volatilization posture with the vent hole 57 facing the same direction as that of the vent hole 38. A volatilization element 60 is installed inside the cover body 50, so as to separate away from the contac part 41 of the suction core 40 when the cover 50 is in the non-volatilization posture, and to come in contact with the contact part 41 of the suction core 40 when the cover 50 is in the volatilization posture.
