An atomizing device is provided that comprises: a casing having a release opening; discharging means provided within the casing and having at least one discharge head for discharging a liquid matter as droplets from a nozzle communicating with a cavity by driving an actuator to change a pressure within the cavity filled with the liquid matter; and atomizing means provided within the casing for atomizing the droplets discharged from the discharging means. It is preferred that at least a part of the discharging means and/or at least a part of the atomizing means are detachably mounted to the casing.