PROBLEM TO BE SOLVED: To provide an outer case which enables easy replacement of a chemical storage container, and to provide a chemical volatilization device using the outer case.SOLUTION: A chemical volatilization device includes: a chemical storage container 1 in which a chemical is stored and an outer case 2. The outer case 2 includes: a case body 5 having an opening part 50 and capable of housing the chemical storage device 1 from the opening part 50 a cover 6 which is attached to the case body 5 so as to slide relative to the case body 5 and opens or closes the opening part 50 and locking means 7 which fixes the cover 6 to the case body 5 at a closing position where the cover 6 closes the opening part 50. The locking means 7 includes: an engagement hole 8 provided at the cover 6 and an engagement piece 9 which is provided in the case body 5 and engages with the engagement hole 8 following slide movement of the cover 6 to the closing position relative to the case body 5.SELECTED DRAWING: Figure 20
