One embodiment of the present invention provides a drug delivery device comprising: a base part; a storage part in which drugs are stored inside; an expansion part which is disposed on the base part, has a first cavity, and pressurizes the storage part; a heating part which is disposed between the base part and the expansion part and heats the first cavity; a flow path part which is disposed in the expansion part, has a second cavity, and guides air inside the second cavity to the storage part; and a discharge part which discharges the drug to an injection target portion.
