The drug delivery device (1) connects an syringe barrel (6) and a drug container (2) by means of a closed system, and delivers a drug between the syringe barrel and drug container through said closed system. This drug delivery device includes a first member (8) connected to the drug container (2) on the side of a stopper (4), and a second member (30) connected at one end to the first member and connected at the other end to the syringe barrel (6). The first member and the second member are connected by a fitting mechanism. A second hollow needle member (34) provided on the second member faces towards the first member, and the tip portion (36) and the base portion (38) are fixed. The first member has a first hollow needle member (12). The first member and the second member each have an elastic member (18 and 40).
