PROBLEM TO BE SOLVED: To improve the operability and visibility of an electric power switch when a device body is miniaturized and a cover of a medicine supporter is enlarged, to improve the visibility of an emitter for operation state notification, and further to increase the designability of a chemical diffusing device by improving the layout flexibility of a motor or the like.SOLUTION: A chemical diffusing device 1 includes a cover 40 forming a housing space R for a medicine supporter 4 together with a device body 5. The cover 40 is mounted on the device body 5 so that the housing space R can be opened at the time of replacement of the medicine supporter 4. The cover 40 is provided with an electric power switch 60 or an operation lamp 63.SELECTED DRAWING: Figure 1
