PROBLEM TO BE SOLVED: To provide an inhalation device capable of atomizing chemical liquid or the like in a set homogeneous particle diameter and capable of easily subjecting fine particles of the chemical liquid or the like to conditioning for imparting sustained-release properties, etc.SOLUTION: An inhalation device 1 includes: a fine particle generation nozzle 2； a classification container 10 for classifying the fine particles generated by the fine particle generation nozzle 2； at least one discharge part 28 for discharging ultrafine particles classified from the fine particles in the classification container 10； particle diameter setting means for setting the particle diameter of the ultrafine particles discharged from the discharge part 28； particle diameter detection means for detecting the particle diameter of the ultrafine particles discharged from the discharge part 28； and first gas pressure control means for controlling the pressure of the gas supplied to the fine particle generation nozzle 2 so that the particle diameter of the ultrafine particles detected by the particle diameter detection means becomes the particle diameter of the ultrafine particles set by the particle diameter setting means. The fine particle generation nozzle 2 can generate fine particles having a core-shell structure.SELECTED DRAWING: Figure 1【課題】設定した均一な粒子径で薬液等を噴霧することができ、しかも、当該薬液等の微粒子に徐放性付与等のためのコーティングを容易に施すことが可能な吸入装置を提供すること。【解決手段】微粒子発生ノズル２、微粒子発生ノズル２により発生させた微粒子を分別する分別容器１０、分別容器１０において微粒子から分別された超微粒子を吐出させる少なくとも１つの吐出部２８、吐出部２８から吐出させる超微粒子の粒子径を設定する粒子径設定手段、吐出部２８から吐出する超微粒子の粒子径を検出する粒子径検出手段、粒子径検出手段により検出された超微粒子の粒子径が粒子径設定手段により設定された超微粒子の粒子径となるように微粒子発生ノズル２に供給される気体の圧力を制御する第１の気体圧制御手段を備え、微粒子発生ノズル２がコア－シェル構造を有する微粒子を発生可能な、吸入装置１。【選択図】図１
