The present invention relates to a drug delivery device and, more specifically, to a drug delivery device which: is able to check whether a drug is normally delivered to the body of a patient or not provides a mechanism which backs up a drug injection syringe needle when the drug injection has been completed and prevents the injected drug from being leaked out of the skin of the patient after being injected. The drug delivery device of the present invention comprises: a syringe (100) provided with a pressure measuring unit (400), which measures the pressure inside a drug storage unit (102) storing a drug to be injected to an injection region in real time a drive unit (200) which has a first motor (210) and is installed so that the syringe (100) can move forward or backward and a plunger drive unit (300) which has a second motor (310) and is connected to the syringe drive unit (200) to drive a plunger (105) of the syringe (100). In the drug delivery device of the present invention, the first motor (210) moves the syringe drive unit (200) so that the syringe (100) can be separated from the injection region when the pressure, measured by the pressure measuring unit (400) in real time after the drug has been injected into the injection region, is lower than or equal to the initial pressure measured when the drug is initially injected into the injection region. Accordingly, the drug delivery device can maintain a state that the drug injected into the skin of the patient is injected into the skin of the patient without being leaked out of the skin surface of the patient even when the syringe needle is escaped from the skin of the patient by backing the syringe after injecting the drug into the injection region including the skin of the patient, etc.COPYRIGHT KIPO 2016본 발명은 약물 전달 기구에 관한 것으로서, 보다 상세하게는 약물의 정상적으로 생체에 전달되었는지를 확인 가능하며, 약물 주입이 완료된 후에 약물 주입 주사기 바늘을 후진시키는 메카니즘을 제공하면서, 주입된 약물이 주입 후 피부 밖으로 흘러 나오는 것을 방지하는 약물 전달 기구에 관한 것으로서, 주사부위에 주입할 약물을 저장하는 약물 저장부(102) 내부의 압력을 실시간
